Keto Marinated Asian Pork Tenderloin

Why I use the slow cooker for pork tenderloin

Pork tenderloin is a lean cut, and that changes everything about how you cook it. A lot of slow cooker pork recipes are written for shoulder or butt, which are fatty cuts that can handle 6-8 hours of low heat. Tenderloin does not work that way. I cook mine on low for 3.5 to 5 hours (depending on thickness) and pull it the moment it hits 145 degrees internally. Go past that and you get dry, stringy meat.

I use a slow cooker with a timer and auto-warm setting so it switches to warm the moment the cook time ends. No overcooked pork even if I lose track of time. If you are cooking this while you are at work, that auto-warm feature is not optional. It is essential.

I have been using the slow cooker for low carb dinners since I started keto, and this is still one of my most-cooked recipes. The marinade does double duty: it flavors the meat while it cooks, so there is no separate marinating step unless you want one.

Freezer dump bag method

This is a true dump-and-go freezer meal. I add the tenderloin and all the marinade ingredients to a gallon Ziploc bag, squeeze out the air, lay it flat, and freeze. When I am ready to cook, I thaw it in the refrigerator overnight and dump the entire bag into the slow cooker the next morning.

I usually prep 2-3 bags at a time. I write the recipe name, cook time, and temperature setting on each bag with a Sharpie so I do not have to look anything up later. Having these in the freezer means I always have a keto dinner ready when I have nothing else planned.

Here is my favorite shortcut: if you did not prep a freezer bag ahead of time, load all the ingredients into your slow cooker liner the night before. Cover it and store the whole thing in the refrigerator. In the morning, drop the liner into the base and press start. It saves about 10 minutes during the morning rush, and the meat picks up extra marinade flavor overnight.

If you like the freezer meal approach, my keto steak marinara uses the same dump bag method with Italian flavors.

Ingredient swaps and the Worcestershire question

I get more comments about Worcestershire sauce on this recipe than anything else, so let me clear it up. Not all Worcestershire uses high fructose corn syrup. Brands like Lea and Perrins use molasses or cane sugar instead. With 2 tablespoons spread across 6 servings, the sauce adds about 1 gram of carbs per serving. That is less than half the sugar in an avocado.

If you still want to cut it down, use 1 tablespoon instead of 2, or add a splash of apple cider vinegar for that same tangy bite. I have made it both ways and the difference is minimal.

For the soy sauce component, I list liquid aminos in the recipe but I have tested all three options. Regular soy sauce works fine (lowest price, strongest flavor). Bragg’s Liquid Aminos is what I use most often. Coconut aminos is the mildest and lowest sodium, but you may need to bump the quantity slightly because it is less concentrated. All three keep this recipe low carb.

My favorite shirataki rice is by Zeroodle. It is the only brand I have found that skips the odd smell and rubbery texture that turns most people off shirataki. I serve it alongside the pork with the cooking liquid spooned over top. If you want more Asian-inspired protein options, my keto teriyaki chicken uses a similar flavor base.