Keto Lemon Mascarpone Tart

This decadent Keto Lemon Mascarpone Tart has a smooth and creamy filling made with homemade Lemon Card and a super flaky gluten-free crust. Topped with whipped cream, this sugar-free dessert is sure to satisfy your sweet tooth!

Keto Lemon Mascarpone Tart slice closeup with tart in background

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❤️ Why You’ll Love This Keto Lemon Tart Recipe

  • Decadent dessert with bold lemon flavor
  • Easy to make in just a few steps
  • Gluten-free and sugar-free
  • Made with healthy ingredients
closeup overhead view od Keto Lemon Mascarpone Tart

This Keto lemon tart is great for a special occasion or even when you’re craving something sweet, but want to stay in Ketosis.  You can top the tart with powdered sugar or whipped cream, or nothing at all!  Either way, it’s just delicious!

slice of Keto Lemon Mascarpone Tart held up

Your guests will fall in love with this tart and they’ll never know that it’s a low carb dessert!

What’s in Keto Mascarpone Lemon Tart

*Exact measurements are listed in the recipe card below.

How to Make Keto Lemon Mascarpone Tart

To Make the Gluten Free Tart Crust

Preheat oven to 350°F.

pie crust dough in food processor

Prepare the pie crust dough according to the directions.

keto pie crust in tart pan

Add the pie crust to a 9 inch nonstick tart pan with a removable bottom. Press it out in an even layer, going up the sides of the pan.

baked tart crust

Prick the bottom of the crust with a fork and bake for 15 minutes or until golden. If the edges brown too quickly, lightly cover them with aluminum foil.

To Make the Lemon Filing

Add the lemon curd, mascarpone, sweetener and most of the heavy cream in the bowl of a food processor. 

lemon tart filling ingredients in food processor unmixed

Mix until smooth and creamy.  If the mixture is too thick, add the remaining heavy cream.

lemon tart filling mixed in food processor

Pour the filing into the cooled tart crust and chill in the fridge for at least 1-2 hours or until set.

lemon mascarpone tart in tart pan

Top with powdered sugar or whipped cream and sliced lemons.

Keto Lemon Mascarpone Tart with lemon slices and whip cream

Are Lemons Keto?

They absolutely are! In fact, lemons are recommended on Keto because of their many health benefits. Where you typically avoid a lot of citrus fruit on Keto, lemons are the exception.

They’re low in sugar, a great source of Vitamin C and contain antioxidants that promote healthy digestion and aid in fluid retention. There’re many other great health benefits discussed in this article on Healthline.

slice of Keto Lemon Mascarpone Tart with tart in background

Tips for the Perfect Keto Lemon Tart

What Sweetener is Best for Sugar Free Tarts

This is a no bake tart, so to keep the filling smooth and creamy, you want to stick to a confectioners sugar substitute. I used a monk fruit/allulose blend has that tastes very much like traditional sugar and doesn’t have any cooling effect, but you can use Swerve confectioners will also work.

How to To Keep Your Lemon Tart Filing Smooth

Confectioner sugar substitutes really helps to keep the lemon curd in these tarts smooth. Depending on the power of your microwave, if it cooks too quickly, it can have a slightly grainy texture. But no worries, if this happens, just run through a fine mesh strainer. Problem solved!

overhead view of Keto Lemon Mascarpone Tart with lemon slices and whip cream

How Do I Keep My Gluten Free Crusts from Breaking?

Tart crusts made with almond flour are very tender when they are still warm. In order to keep them from crumbling, allow them to cool in the tart pan for at least 15 minutes before removing them.

Can I Freeze Keto Mascarpone Lemon Tart?

You sure can. This gluten free lemon tart makes for a great make ahead dessert. For best results, place the tart back into the tart pan and wrap the pan and tart in plastic wrap.

To thaw, just place it in the fridge over night, then slice and serve when ready.

Keto Lemon Mascarpone Tart with slice missing

What Toppings are Good with Mascarpone Lemon Tart?

This rich and creamy lemon tart is perfect with just a little whipped topping but you can add fresh berries if you prefer. You can even drizzle it with a little sugar-free fruit sauce like these Raspberry, Strawberry or Blueberry sauces.

slice of Keto Lemon Mascarpone Tart held up

More Keto Lemon Desserts

Keto Lemon Mascarpone Tart pins

If you’d like to know more about baking on Keto, this article, Keto Baking Made Easy, is loaded with tips and info that you’ll find helpful. You might also check out my Keto Sweet Treats eBook that has 50 amazing Keto dessert recipes, all with color pics, macros and more! I’m offering it at 50% off when you subscribe to my free weekly emails here.

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Keto Lemon Mascarpone Tart slice closeup

Keto Lemon Mascarpone Tart

Homemade lemon curd and mascarpone cheese, make this tart smooth, creamy and so decadent!
5 from 2 votes
Author: Julianne
Servings 8
PREP 10 minutes
COOK 15 minutes
Chill 1 hour
TOTAL 25 minutes

RECIPE VIDEO

Ingredients
 

Instructions
 

To Make the Tart Crust

  • Preheat oven to 350°F. Prepare the pie crust dough according to the directions.
  • Add the pie crust to a 9 inch nonstick tart pan with a removable bottom. Press it out in an even layer, going up the sides of the pan.
  • Prick the bottom of the crust with a fork and bake for 15 minutes or until golden. If the edges brown too quickly, lightly cover them with aluminum foil.

To Make the Filling

  • Add the lemon curd, mascarpone, sweetener and most of the heavy cream in the bowl of a food processor
  • Mix until smooth and creamy.  If mixture is too thick, add the remaining heavy cream.
  • Pour the filing into the cooled tart crust and chill in the fridge for at least 1-2 hours or until set. Top with powdered sugar or whipped cream and sliced lemons.

Recipe Notes

If you can’t find mascarpone cheese, you can use cream cheese instead.  Just be sure to adjust your macros and know that this tart will taste more like a cheesecake.

*Make sure to scroll up and read the post for substitutions, additions and helpful tips for making this recipe.

Course Dessert
Cuisine Italian
Calories 369kcal
Nutrition Facts
Keto Lemon Mascarpone Tart
Amount per Serving
Calories
369
% Daily Value*
Fat
 
24
g
37
%
Saturated Fat
 
13
g
81
%
Carbohydrates
 
6
g
2
%
Fiber
 
3
g
13
%
Sugar
 
1
g
1
%
Protein
 
9
g
18
%
* Percent Daily Values are based on a 2000 calorie diet.

*Nutritional data is provided as a courtesy and is accurate to the best of my knowledge. You can verify it using the nutrition calculator of your choice. All data is based on net carbs, without sugar alcohol: Swerve, Erythritol, Monk Fruit or Allulose.

© Copyright for Keto Cooking Christian LLC. Please use the share buttons to share on social media, but please do not copy/paste the recipe.

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Originally published on May 10, 2018, updated on April 15, 2022 with improvements to the recipe, new photos and helpful tips.

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11 Comments

  1. Thanks for the reminder that cream cheese does have carbs! I’d forgotten and was thinking it was like cream, no carbs. Also love your site, love the name!

  2. So I made the crust exacly like the recipe says and used parchment and beans for weight an after 15 min it is still so raw. What did I do wrong?

    1. The tart pan that I use has a removable bottom, which makes it easier. But it shouldn’t stick anyway, since there’s a fair amount of butter in the crust.

    1. Hi Ruth,
      Most grocery stores sell it, I typically buy mine from Walmart because they seem to have the best price! It’s sort of like cream cheese, but milder in flavor and has a lot less carbs. I use it a lot because it doesn’t overpower the dish, and it’s great for thickening and adding creaminess!

    1. Hi Kelli,
      I used a 9″ tart pan, but a pie dish should also work. When you press out the crust, don’t go all the way up the sides. Pie dishes typically have higher sides than a tart pan, so there wouldn’t be enough filling to reach the top. I hope that helps!