Keto Lemon Posset

Keto lemon possets are a no-bake, creamy citrus dessert with only 3 main ingredients (cream, lemon, and a sweetener) plus a 4th ingredient for the berry topping.

Course Dessert
Cuisine American
Prep Time 20 minutes
Cook Time 5 minutes
Cooling 3 hours 30 minutes
Total Time 25 minutes
Servings 3 lemon possets
Calories 280 kcal


  • 1 cup heavy whipping cream
  • 1/4 cup (1 1/2 oz) confectioners swerve sweetener (measure by weight for best results; if using volume, it should be loosely packed)
  • 1 large lemon
  • 1/3 cup (2 oz) fresh blueberries (other berries or a mix of them would work too, like raspberries or blackberries)


  1. Grate the lemon until you have 1 tablespoon of grated lemon zest, taking care to avoid the bitter white pith of the peel. Cut and squeeze the lemon until you have 3 tablespoons of fresh lemon juice.
  2. In a medium saucepan (I use a 7-inch wide and 3.5-inch tall nonstick pan), add heavy cream, swerve, and 1 tablespoon of lemon zest. Don't add the lemon juice. Avoid smaller saucepans because the cream will take up significant volume once it starts to boil.
  3. Place the saucepan over medium-high heat. While waiting for the mixture to come to a boil, stir constantly to dissolve the sweetener, about 1 minute.
  4. When a rapid foamy boil is established, stir frequently and decrease the heat as needed to maintain a steady boil. Watch carefully to avoid boiling over. When 5 minutes of foamy boiling have elapsed, immediately turn off the heat and pour the mixture into a heatproof measuring glass. The mixture should be reduced to just shy of 1 cup; if you have more than that, pour the mixture back into the saucepan and boil for another 1-2 minutes and measure again.
  5. With the mixture in the measuring glass, add 3 tablespoons of lemon juice and stir it in. Let the mixture sit at room temperature for about 30 minutes or until a skin forms on top, keeping it in a cool area away from hot ovens.
  6. Using a fine mesh (I use a nut milk bag), strain out all solids including lemon zest, applying pressure to the mesh to squeeze out liquid. Discard the solids. You should be left with a smooth and thick liquid, about 2/3 cup.
  7. Evenly divide the liquid among 3 tiny serving glasses or bowls. I use glass prep bowls that can hold about 1/2 cup (4 fl oz) each.
  8. Refrigerate them uncovered for 3 hours. Once they're set, top with blueberries and cover with plastic wrap. Store them in the refrigerator for up to 1 day until ready to serve.

Nutrition Info

Makes 3 Servings
Amount Per Serving (1 posset):
Calories 280  
Total Fat 29g 44%
   Saturated Fat 18g 91%
Cholesterol 90mg 30%
Sodium 20mg 1%
Net Carb 5.5g  
Total Carb 6g 2%
   Dietary Fiber 0.5g 2%
   Sugars 4.5g  
Protein 2g  
Vitamin A 23% · Vitamin C 4% · Calcium 5% · Iron 0%