Mini Keto Lemon Tarts

I started making these in mini form because I wanted something I could set out at a party without slicing a full pie. The mini muffin tin turned out to be the better format in every way: the crust-to-curd ratio is spot on in each bite, they're easy to grab, and they look like they came from a French patisserie. If you've made my mini cheesecakes, you know the appeal of this format.

The crust is a flaky dough made from almond flour, coconut flour, cold butter, and cream cheese. I use rice vinegar and xanthan gum to give it enough structure to roll out and cut clean circles without cracking. The dough needs to stay cold while you work, so I roll it between two sheets of parchment and refrigerate it if it starts getting soft. When it bakes, the edges turn golden and shatter when you bite through to the curd underneath.

What makes this recipe worth the effort is the curd. I use the zest and juice of 4-5 fresh lemons, cook it with egg yolks over medium heat until it thickens enough to coat a spoon, then stir in cold butter off the heat two tablespoons at a time. That step is what gives it the silky, rich texture that tastes like the center of a lemon meringue pie without any sugar. I've made this curd dozens of times and it's the part people always ask me about. A reader named Dana made these for a snow day and said they looked 'like something from an actual coffee shop.'

At 0.5g carbs per tart, eating three or four doesn't derail anything. These sit well alongside other keto desserts if you're building a spread. I like them next to something rich like chocolate trifle or coconut cream pie, and strawberry pie adds a fruity contrast on the same table.

One batch makes 44 mini tarts, which sounds like a lot until you watch them disappear. I usually make the crust and curd on separate days (the curd benefits from an overnight chill) and assemble on day three. For another low carb crowd-pleaser at the same gathering, my banana pudding always goes fast.

Fresh lemon curd

Inside every one of these is a creamy, silky curd with real citrus tang. I use the zest and juice from fresh lemons (not bottled) because the difference in flavor is obvious. The egg yolks thicken the mixture as it cooks, and you stir in cold butter off the heat to get that rich, velvety finish. I always refrigerate it for at least two hours before filling the shells because the curd firms up significantly as it cools.

Can I use bottled lemon juice?

Fresh squeezed gives the best flavor, and I always use it. But if you’re in a pinch, bottled works. Add 1/2 teaspoon of lemon extract to compensate for the missing zest intensity. I’ve done this once when I ran out of lemons mid-batch and it was still good, just not as bright.

What about the sweetener?

I use powdered allulose because it dissolves completely and doesn’t crystallize when chilled. That matters here since the curd sits in the fridge. Erythritol-based sweeteners can recrystallize in cold applications and leave a grainy texture. If allulose isn’t available, powdered monk fruit works, but use about 2/3 the amount since it’s sweeter.

What to do with leftover curd

I almost always have curd left over, and I’m not mad about it. Here’s what I do with it:

• Spread it on toast or muffins. It has a texture like jelly and works as a topping on anything you’d normally spread jam on.
• Layer it into desserts. I’ve used it as a filling between layers of strawberry cake and swirled into ice cream cake. The citrus cuts through rich flavors surprisingly well.
• Top pancakes or waffles. A dollop instead of syrup adds a fresh, tangy finish.
• Eat it straight from the jar. I do this. No regrets.

Other crust options

If you want a quicker keto crust, here are alternatives I’ve tried:

• Press-in almond flour crust. Skip the rolling and cutting. Mix almond flour with melted butter and a pinch of salt, press directly into each muffin cavity, and bake at the same temperature. It’s sturdier but less flaky. I use this when I’m short on time.
• Cookie dough crust. A simple almond flour cookie base works here. Press a small ball of dough into each cavity and bake until the edges turn golden. It adds a sweeter, more buttery flavor that pairs well with the tart curd.
• Swap out the coconut flour. If coconut flour bothers your stomach or you don’t like the taste, replace it with 6-8 tablespoons of additional almond flour. The cream cheese in this recipe helps neutralize the coconut flavor, but going all almond flour works too. I’ve had readers with FODMAP sensitivities do this with good results.

Storage and make-ahead

I store both the components and assembled tarts, and they hold up well either way.

Make-ahead strategy

This is one of those recipes that benefits from being made ahead. I usually make the crust on day one and the curd on day two, then assemble on day three. The curd needs at least two hours in the fridge anyway, and it only gets better overnight. Unbaked crust dough keeps in the fridge for 5 days or the freezer for 3 months (store it as a ball or rolled out in a freezer-safe bag). Curd stores separately in the fridge for a week or the freezer for 3 months.

Assembled tarts

Once filled, the tarts stay fresh in the fridge for 7 days. For freezing, I lay them individually on a sheet pan until solid, then transfer to a freezer bag. They keep for about a month frozen. Let them thaw in the fridge for an hour before serving since the curd firms up quite a bit when frozen.