Keto Lemon Meringue Pie

Introduction

Can a dessert this tangy, this fluffy, and this satisfying really contain less than 6 grams of net carbs per slice? That’s the question most low-carb bakers ask the first time they hear about keto lemon meringue pie, and the answer is yes. This keto lemon meringue pie recipe swaps out the sugar and wheat flour for almond flour and a keto-friendly sweetener, while keeping every bit of the bright, citrusy filling and cloud-like meringue topping that makes the classic version so beloved. If you’ve been missing pie night since starting keto, this recipe brings it back to the table guilt-free. Craving more? Browse our full collection of keto dessert recipes for other low-carb sweets worth adding to your rotation.

Ingredients List

Here’s everything you need to make keto lemon meringue pie from scratch, along with a few smart substitution options in case your pantry looks a little different from mine.

For the crust:

• 2 cups almond flour (finely ground, for the best texture)
• 1/4 cup melted butter (or coconut oil for a dairy-free crust)
• 1 large egg
• 2 tablespoons powdered erythritol or allulose
• Pinch of salt

For the lemon filling:

• 3/4 cup fresh lemon juice (about 4-5 lemons)
• 1 tablespoon lemon zest, finely grated
• 3/4 cup powdered erythritol or allulose
• 4 large egg yolks
• 2 whole eggs
• 4 tablespoons butter, cubed
• 1 teaspoon xanthan gum (helps the filling set without cornstarch)

For the meringue:

• 4 large egg whites, room temperature
• 1/4 teaspoon cream of tartar
• 1/3 cup powdered erythritol
• 1/2 teaspoon vanilla extract

I chose every ingredient here to keep this keto lemon meringue pie recipe low-carb and true to the original flavor. If you’re avoiding erythritol, monk fruit sweetener blends work well as a 1:1 swap in every part of this recipe. Allergic to almonds? Sunflower seed flour makes a solid crust substitute, though it can turn the crust slightly green from a harmless chemical reaction with the baking soda. Most people will tolerate erythritol, though Cleveland Clinic notes that large amounts of any sugar alcohol can cause mild digestive discomfort, so it’s worth introducing it gradually if you’re new to keto baking.

Timing

• Prep time: 30 minutes
• Cook time: 45 minutes
• Cooling/chilling time: 2 hours
• Total time: About 3 hours and 15 minutes

That might sound long, but most of it is hands-off chilling time. Active work on this keto lemon meringue pie recipe totals roughly 75 minutes, which is noticeably shorter than many traditional meringue pie recipes that call for a longer blind-bake and multiple resting stages.

Step-by-Step Instructions

Step 1: Make and bake the crust

For a deeper dive into getting this base just right, check out our guide to almond flour pie crust. Preheat your oven to 350°F (175°C). Combine almond flour, melted butter, egg, sweetener, and salt in a bowl until a soft dough forms. Press it evenly into a 9-inch pie dish, working it up the sides. Bake for 12-15 minutes until lightly golden, then let it cool completely on a wire rack. Tip: prick the bottom with a fork before baking to prevent it from puffing up.

Step 2: Cook the lemon filling

In a saucepan over medium heat, whisk together lemon juice, zest, sweetener, egg yolks, and whole eggs. Stir constantly for 6-8 minutes until the mixture thickens enough to coat the back of a spoon. Whisk in the xanthan gum a little at a time to avoid clumping, then remove from heat and stir in the butter until glossy. Tip: Don’t rush this step; low, steady heat prevents the eggs from scrambling.

Step 3: Assemble and chill

Pour the warm lemon filling into the cooled crust and smooth the top. Refrigerate for at least 1 hour, or until fully set, before adding the meringue.

Step 4: Whip the meringue

Beat egg whites and cream of tartar on medium speed until foamy. Gradually add the powdered sweetener, one tablespoon at a time, beating until stiff, glossy peaks form. Fold in the vanilla at the end.

Step 5: Top and toast

Pile the meringue onto the chilled filling, spreading it to the edges to seal in moisture and prevent shrinkage. Use the back of a spoon to create decorative peaks, then toast with a kitchen torch or under the broiler for 1-2 minutes until golden. Watch the meringue brown fast.

Nutritional Information

Understanding the macros behind keto lemon meringue pie can help you fit it into your daily carb count. As Harvard’s T.H. Chan School of Public Health explains, net carbs total carbs minus fiber and most sugar alcohols are what actually matter for staying in ketosis, which is why this pie’s carb count looks so favorable. Approximate values per slice (based on 10 slices):

• Calories: 245
• Net carbs: 5g
• Fat: 21g
• Protein: 7g
• Fiber: 3g
• Sugar alcohols: 8g (not counted toward net carbs)

Compared to a traditional lemon meringue pie slice, which often carries 35-45g of carbs, this version cuts carbs by roughly 85-90% while keeping the fat and protein your body actually uses for steady energy on keto.

Healthier Alternatives for the Recipe

Want to lighten this keto lemon meringue pie recipe even further? Try these swaps:

• Use Greek yogurt in place of some of the butter in the filling for a tangier, lower-fat result.
• Swap allulose for erythritol if you’re sensitive to sugar alcohols and prefer a sweetener with minimal digestive effects.
• Make it dairy-free by using coconut oil instead of butter throughout.
• For an egg-white-only crust option (fewer carbs from almond flour), press a thin layer of the filling into a nut-free “cup” made from baked coconut flour and butter.

Serving Suggestions

This keto lemon meringue pie is a showstopper on its own, but a few finishing touches take it further. Add a light dusting of lemon zest right before serving for extra aroma. Pair a slice with a dollop of unsweetened whipped cream, or serve alongside a hot cup of black coffee to balance the pie’s sweetness. Hosting a keto-friendly dinner party? Cut smaller slices and serve on a dessert board next to keto shortbread cookies for a variety of textures and flavors. If citrus isn’t the only flavor your guests love, our keto coconut cream pie makes a great second option on the dessert table.

Common Mistakes to Avoid

• Skipping the chill time: Cutting into the filling before it sets fully will give you a runny slice instead of clean, defined layers.
• Overheating the lemon filling: Cooking it too fast over high heat scrambles the eggs instead of thickening them smoothly.
  These are the mistakes that most often keep a keto lemon meringue pie from turning out picture-perfect.
• Under-beating the meringue: Soft peaks won’t hold their shape once toasted; beat until stiff and glossy.
• Not sealing the meringue to the crust edges: Gaps let moisture escape, leading to weeping meringue.
• Using granulated instead of powdered sweetener in the meringue: Granulated sweetener doesn’t dissolve fully, leaving a gritty texture.

Storing Tips for the Recipe

Keto lemon meringue pie is best stored in the refrigerator, loosely covered, for up to 4 days. The meringue is more delicate than the filling and may start to weep slightly after day two; this is normal and doesn’t affect the taste. This pie doesn’t freeze well due to the meringue’s texture, so it’s best enjoyed fresh within a few days. If you want to prep ahead, you can make the crust and filling up to 2 days in advance and add the meringue the day you plan to serve it.

Conclusion

Keto lemon meringue pie proves you don’t have to give up dessert on a low-carb lifestyle. With a buttery almond flour crust, tangy lemon filling, and fluffy toasted meringue, it delivers all the classic flavor in a fraction of the carbs. Try this recipe, and let us know how it turned out. Drop a comment below, or subscribe for more low-carb dessert ideas.

FAQs

Keto Lemon Meringue Pie

Recipe by Leese

0.0 from 0 votes

Course: DessertCuisine: American

Servings

10

servings

Prep time

30

minutes

Cooking time

45

minutes

Total time

3

hours 

15

minutes

A low-carb keto lemon meringue pie with a buttery almond flour crust, tangy lemon filling, and fluffy toasted meringue.

Ingredients

• 2 cups almond flour

• 1/4 cup melted butter

• 1 large egg

• 2 tbsp powdered erythritol

• 3/4 cup fresh lemon juice

• 1 tbsp lemon zest

• 3/4 cup powdered erythritol

• 4 large egg yolks

• 2 whole eggs

• 4 tbsp butter

• 1 tsp xanthan gum

• 4 large egg whites

• 1/4 tsp cream of tartar

• 1/3 cup powdered erythritol

• 1/2 tsp vanilla extract

Directions

• Make and bake the crust:
  Combine almond flour, butter, egg, sweetener, and salt. Press into a pie dish and bake at 350°F for 12-15 minutes.
• Cook the lemon filling:
  Whisk lemon juice, zest, sweetener, and eggs over medium heat until thickened. Whisk in xanthan gum, then butter.
• Assemble and chill:
  Pour filling into cooled crust and refrigerate for at least 1 hour.
• Whip the meringue:
  Beat egg whites and cream of tartar; gradually add sweetener until stiff peaks form.
• Top and toast:
  Spread meringue over chilled filling and toast until golden.