Low Carb Keto Lemon Custard with Blueberries

Low Carb Keto Lemon Custard with Blueberries

Today we're going to make a custard called a "posset".

I learned about this dessert from an article in Cook's Illustrated.  A recipe developer named Annie Petito dug up this classic English recipe and painstakingly developed it.  (below)  I love reading about the lengths that these developers go to.  I always walk away confident that I am making the very best version of a recipe.


And this one is no different.  

The recipe takes four simple ingredients and creates a rich creamy dessert that is very close in taste and consistency to Key Lime Pie.  The bright lemon flavoring pairs perfectly with fresh blueberries.  The heavy cream base makes it incredibly decadent.  (But worth every calorie.)

 Low Carb Lemon Custard with Blueberries Recipe

This morning I put on my test kitchen hat and came up with a sugar-free version of the recipe.  

It's a perfectly sweet posset that has only 7g net carbs per serving.


 Low Carb Lemon Custard with Blueberries Recipe

NOTE: To make this recipe you'll need to reduce your liquid by 1/3.  An easy way to do this is to use a ruler.  Check the depth of the mixture before you boil it.  Calculate 2/3 of that number and mark it on your ruler.  Then check back in with your ruler until the liquid hits your mark. 



Low Carb Lemon Custard with Blueberries


  • 2 cups heavy whipping cream

  • 6 tablespoon Swerve or equivalent sweetener

  • 6 tablespoonsl emon juice (2 lemons)

  • 1 tablespoon lemon zest (1 lemon)

  • 1/2 cup blueberries


1.  Combine cream, sweetener and lemon zest in a medium size saucepan. Measure the depth and calculate 2/3 of that amount. Mark your ruler at the 2/3 line.

2.  Bring to a boil over medium heat. Continue to boil, stirring often to dissolve the sweetener. If mixture begins to boil over, remove from heat and stir. Return to lowered heat. Cook until the mixture has reduced by 1/3 (your marked line). This should take between 8-12 minutes.

3.  Remove the saucepan from heat and stir in the lemon juice.

4.  Let the mixture cool until a skin forms, about 20 minutes. Strain through a fine-mesh strainer into a bowl and discard the skin and zest.

5.  Divide the mixture into 4 ramekins or serving glasses.

6.  Refrigerate uncovered, until set, at least 3 hours.

7.  Serve with blueberries on top.



NUTRITIONAL INFO: Calories 431 Total Fat 45g Protein 3g Carb 8g Fiber 1g Net Carbs 7g

You'll need this specialty ingredient:

 Low Carb Keto Lemon Custard with Blueberries Recipe
Napoleon Dynamite Gifs

Napoleon Dynamite Gifs

Low Carb Keto Cloud Bread

Low Carb Keto Cloud Bread