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Keto Marinated Asian Pork Tenderloin

Sliced pork tenderloin in a savory sesame and soy marinade, with dry mustard, Worcestershire and a little heat. Prepare it as a freezer meal, thaw completely, then let the slow cooker do the cooking. Check for 145°F and rest for 3 minutes before slicing.
  • 2.7gnet carbs
  • 32.4gprotein
  • 190minutes
  • 6servings

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This pork tenderloin was one of the dump-and-go dinners in my freezer-meal video. The appeal is in the preparation: put the pork and marinade in a bag together, freeze it flat, and thaw it in the refrigerator when you want to cook it.

Sesame oil, soy sauce or liquid aminos, dry mustard and Worcestershire give the marinade its savory flavor. The sweetener and lemon juice balance it, with red pepper flakes for a little heat. Serve the sliced pork over broccoli slaw or cauliflower rice, with some of the cooking liquid spooned over the top.

Plan this as a shorter slow-cooker dinner. Tenderloin is lean and intended for slicing. Start checking near the early end of the cooking range; a timer cannot tell you whether the center has reached 145°F.

plated of sliced marinated keto pork tenderloin next to cauli rice and broccoli slaw

Why I use the slow cooker for pork tenderloin

pouring low-carb marinated pork tenderloin into a slow cooker liner

Use pork tenderloin, the narrow cut, rather than a large pork loin roast or pork shoulder. Cook on low for about 3.5–5 hours or high for 2–3 hours, checking the thickest part with a thermometer. Remove at 145°F and let it rest for at least 3 minutes before slicing.

The time varies with the thickness of the meat and the cooker. An automatic warm setting does not stop the pork from continuing to cook, so it cannot guarantee juicy tenderloin after a long hold. The card’s three-hour cook estimate corresponds to the high setting; low takes longer.

Freezer dump bag method

keto marinated pork tenderloin freezer meal in the freezer

Add the pork and marinade ingredients to a freezer bag, press out excess air, seal and freeze flat. Label the bag with the recipe and date. Thaw completely in the refrigerator on a tray before transferring to the slow cooker; a thick frozen package may need more than one night.

Do not put frozen pork directly into the slow cooker. If preparing the night before without freezing, refrigerate the pork and marinade in a covered food container. Transfer to the cooker when you are ready to begin, following its instructions for cold ingredients and fill level.

keto asian sauce over broccoli slaw

Ingredient swaps and the Worcestershire question

Liquid aminos and soy sauce are the options in the card. Their salt and carb amounts vary by brand; coconut aminos is a different product and can add more sweetness. Check labels before substituting.

Worcestershire contributes tang and savory flavor. Its ingredients and carbs also vary by brand, so calculate its contribution from the amount used across all six servings. Reducing it or substituting vinegar changes the flavor; those are variations, not the base recipe. The existing nutrition estimate is for one sixth of the recipe and will vary with the pork and condiments.

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The recipe

Keto Marinated Asian Pork Tenderloin

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Prep 10 min Cook 180 min Total 190 min Serves 6

Ingredients

Servings 6

Keto Marinated Asian Pork Tenderloin in the Slow Cooker Ingredients

Step by Step Instructions

  1. Add everything to slow cooker

    Use fully thawed pork tenderloin. Add the pork and all marinade ingredients to the slow cooker, following the appliance instructions for fill level.

    marinated pork tenderloin in a crock pot
  2. Slow cook instructions

    Cover and cook on low for about 3.5–5 hours or high for 2–3 hours, until the thickest part of the pork reaches 145°F. Begin checking near the early end of the range; thickness and slow cookers vary. The three-hour cook estimate in the card is for the high setting.

    cooking asian pork tenderloin in a slow cooker
  3. Rest and serve

    Remove the pork from the cooker and rest for at least 3 minutes before slicing. Serve over broccoli slaw or cauliflower rice with some of the cooking liquid. This is the slow-cooker method; do not pressure-cook the marinade as written.

  4. Freezer instructions

    For a freezer meal, put the pork and all marinade ingredients in a freezer bag, press out excess air, seal and freeze flat. Thaw completely in the refrigerator on a tray before cooking; allow more than one night if needed. Transfer to the slow cooker and follow the slow-cooker directions above. Do not slow-cook from frozen.

    marinated pork tenderloin ingredients in a freezer bag

Nutrition

Per serving: 1/6 of recipe

Calories
287
Fat
16.9g
Protein
32.4g
Total carbs
2.7g
Net carbs
2.7g

Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.

Frequently Asked Questions

How do I know when pork tenderloin is done in the slow cooker?

I pull mine when it hits 145 degrees on an instant-read thermometer. For my slow cooker on low, that takes 3.5 to 5 hours depending on the thickness of the tenderloin. I have learned the hard way that going past 155 degrees dries it out fast. This is a lean cut, not a pork shoulder, so it does not need 6-8 hours.

Should I reduce the cooking liquid before serving?

It is worth the extra minutes. I pour the cooking liquid into a small saucepan and reduce it over medium heat for 6-8 minutes while the pork rests. It goes almost syrupy and clings to the slices instead of pooling under them. If I skip that step, I just spoon it straight over cauliflower rice or broccoli slaw and it soaks in like a glaze.

Is pork tenderloin good for a keto diet?

Yes. Pork tenderloin is one of the leanest cuts I put in my slow cooker, and this recipe works out to 2.7g net carbs, 32.4g protein, and 287 calories per serving. I sweeten my marinade with golden monk fruit instead of sugar, so the whole dish stays keto.

How do I store and reheat leftovers?

I slice the pork before storing it in an airtight container with some of the cooking liquid. It keeps in the refrigerator for 4 days. I reheat slices in a skillet over medium heat with a splash of the sauce so they do not dry out. You can also freeze the sliced pork for up to 3 months. I lay the slices flat in a freezer bag so I can pull out just what I need.

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Reviews

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4.7 from 28 ratings, 12 written

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Your rating

Phil

This was really good. My family asked for it again before I even put the leftovers away.

Reply

Valerie

Worcestershire in an Asian marinade read like a typo to me. Almost swapped it for more sesame oil. Didn’t. It does something at the back of the sauce that every similar recipe I’ve made without it is missing. Don’t skip it.

Reply

Annie Lampella

Thanks Valerie! That back-of-the-sauce thing is exactly why it stays in. Nobody can name it and everybody notices when it’s gone.

Reply

Rebecca

I’m the only keto eater in the house, so I made this for myself and didn’t plan to share. My daughter ate half the pork before dinner. She doesn’t eat pork. My best guess is the dry mustard and Worcestershire together. They cut the sweetness and pull the whole thing into savory-umami territory instead of just sweet.

Reply

Annie Lampella

A non-pork eater eating half the pork before dinner is the only review that matters. I hear that a lot with this one.

Reply

Christine

I made this for a pool day this month and brought it sliced with the cooking liquid separate. Poured it over when I got there and it tightened up in the heat, clung to the slices instead of pooling. Someone who meal preps every week asked about the Worcestershire specifically, said it gave it more body than she’d expect from an Asian marinade. Good to know for summer.

Reply

Lindsey

2.7 net carbs for something that smells like the sesame noodle place my coworkers always order from (I’m the only one eating low-carb, so this felt like a real win). First time I’ve done a slow cooker marinade and I kept waiting to have to do something to it. You really do just walk away. Still surprises me. The pork came apart when I tried to scoop it and the cooking liquid went thick and glossy, which I wasn’t expecting. One question though: do you reduce that liquid before serving or just pour it over? Wasn’t sure if there was a step I missed.

Reply

Annie Lampella

The liquid thickens on its own in the slow cooker, but I usually reduce it on the stove. 6-8 minutes on medium and it goes almost syrupy, clings to the slices instead of pooling.

Reply

Lindsey

Oh that makes sense, I just poured it straight over and it went thin everywhere. Trying the stove reduction next batch.

Reply

Brooke

If you’re using the freezer bag method, double the marinade. The pork absorbs way more sitting in the freezer than it does fresh, and you’ll want that extra sauce to spoon over it after. I’ve tried a bunch of Asian slow cooker pork recipes and none of them quite hit this combo, though I pull back on the monk fruit slightly (the sauce gets sweeter as it cooks down). The dry mustard is the thing I didn’t notice until I made a version without it and couldn’t figure out what was off.

Reply

Annie Lampella

The dry mustard thing is exactly right. Without it the sauce tastes flat in a way nobody can quite name. I had someone make this three times trying to figure out what was off before I suggested adding the mustard back. The monk fruit building as it cooks is real too, I pull back about a tablespoon on a long slow cook. The freezer bag pulls in way more marinade as it thaws than fresh does.

Reply

Lorraine

Steam hits you when you lift the lid around hour four, and the smell is already good, but here’s the thing I started doing on batch two: pour the cooking liquid into a small saucepan and reduce it on medium-high while the pork rests, maybe 8 minutes. It goes from watery to glossy and actually sticks to the sliced meat. Takes almost nothing and it tastes like a completely different dish. Four stars as-written, five if you do the reduction step.

Reply

Annie Lampella

Reducing the cooking liquid is worth the 8 minutes. Mine goes almost sticky and clings to the slices instead of just pooling under them. I do it every time now.

Reply

Drew

There was a takeout spot near where I grew up, Friday nights after practice. The sesame and that sweet-soy thing they had going, I didn’t realize I’d given that up until this came out of the slow cooker smelling exactly like it. Making it weekly now.

Reply

Annie Lampella

The slow cooker does something to sesame oil that a skillet never could. Mine smells like that by hour two, and you’ve still got two hours left to wait.

Reply

Brian

Fourth time with this one and I finally added a splash of rice wine vinegar to the marinade. Cuts through the sweetness from the monk fruit and gives the pork this sharper, more complex flavor. The base recipe is already solid, but this is how I’m making it from now on.

Reply

Annie Lampella

The lemon juice is already in there but it doesn’t cut through monk fruit the same way. Rice wine vinegar has a sharper bite to it. Good call.

Reply

Natalie

Wasn’t sure the monk fruit would hold up in a savory marinade but it caramelizes into the pork in a way that reads more teriyaki than sweetener. Made this on a Wednesday and ate it cold out of the fridge the next morning.

Reply

Annie Lampella

That caramelization is the golden monk fruit doing its thing. And cold out of the fridge the next morning is exactly how I eat mine.

Reply

Yuki

The pork was falling-apart tender at 4 hours on low. Surprised me, honestly. I’d been braced for the full 5. The monk fruit runs sweet though, sweeter than I expected with the soy sauce and dry mustard in there (I double-checked twice thinking I’d misread). Still made it twice this month, dropping to 3 tablespoons of monk fruit and it’s much closer to what I wanted.

Reply

Annie Lampella

4 hours is right when the tenderloin runs on the thinner side. And yeah, the dry mustard punches up the sweetness in a way that catches people off guard. 3 tablespoons sounds like the fix.

Reply

Donna

My son smelled it from the front door and was in the kitchen before his bag hit the floor. He’s 15 and doesn’t care about keto, which is the real test. Going in the weeknight rotation.

Reply

Annie Lampella

‘Doesn’t care about keto’ and still ran for it. That’s the whole review. I keep a few of these bags in the freezer for exactly those nights.

Reply

Elaine

Freaking delicious but I’ll cut the monk fruit back by a tablespoon next time because at full measure with the liquid aminos it tips sweet when I want that soy and sesame punch up front.

Reply

Annie Lampella

Yeah, one tablespoon less is probably right. Bragg’s is salty enough to hold the sweetness in check, but some of the other brands don’t and it tips exactly like you’re describing.

Reply

Mike

Three times in two months and it keeps landing. The sesame oil does something to the pork over those hours that I can’t fully explain, just this almost-glossy coating that pulls all the savory from the liquid aminos into the meat. My one note: 3.5 hours on low is where I’d stop if your slow cooker runs hot. Pushed it to 4.5 once and the edges dried out on me. Not a dealbreaker, still on repeat.

Reply

Annie Lampella

Start checking near the early end of the cooking range. The thickest part should reach 145°F, followed by a rest of at least 3 minutes before slicing; the thermometer matters more than the clock.

Reply

Renee Moore

There’s a specific kind of takeout I used to order every week before keto, and I’d honestly written off ever having that flavor again. The liquid aminos and sesame oil together in this marinade, it’s close enough that I actually stopped eating for a second. Made it Sunday, house smelled incredible while it slow cooked, and I just kept thinking I get to eat this on a regular Tuesday night. Going in my permanent rotation.

Reply

Annie Lampella

That stop-mid-bite moment is real. Spoon some of the cooking liquid over your side (I do broccoli slaw). It carries the sesame-amino flavor through the whole plate.

Reply

Barbara

Worchestershire is full of sugar high fructose corn syrup etc. Do u have a sub for this. One carb per teaspoon and recipe calls for 2 T

Reply

NEAL J SEARLE

mountain out of a molehill in my opinion. Most of the sauce isn’t eaten after the pork is finished. Some is spead over each serving to taste. Almost none of the worchestershire is absorbed into the meet during cooking. I think those of us dedicated to keto can handle < .5g carbs.

Reply

Lisa

You can use 2 T Bragg’s Liquid Aminos instead or Lea & Perrins Worcestershire sauce is only 1 g carbs

Reply

Lisa

I don’t find the worcestershire sauce as bad as the monk fruit or erythritol. Maybe I could sub it with some chicken bone broth?

Reply

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