Creamy, tangy, and beautifully served in lemon cups, this Lemon Posset is a simple yet elegant dessert. With just a few ingredients—cream, sugar, and fresh lemon juice—it sets into a silky, refreshing treat that’s perfect for any occasion.
What’s Lemon Posset? 🍋
Lemon posset is a classic British dessert made from just three ingredients – cream, sugar, and lemon juice. The lemon naturally thickens the sweetened cream into a silky, custard-like texture without the need for eggs or gelatin. It’s rich, refreshing, and surprisingly easy to make.
The taste is luxuriously creamy with a bright, tangy kick from fresh lemon juice. The texture of lemon posset is silky-smooth—firmer than a custard but softer than crème brûlée. It has a delicate, melt-in-your-mouth creaminess that holds its shape while still feeling light and luscious. Each spoonful feels indulgent but never heavy, leaving a clean, sweet-tart finish.
Traditionally served in cups or ramekins, but it’s also popular to use hollowed lemon peels for a prettier presentation – and fewer dishes to wash.
The Science Behind Lemon Posset 🔬
Have you ever imagined making a pudding without using gelatin? Lemon posset does exactly that!
When you heat cream and sugar, the mixture becomes warm, smooth, and slightly thickened. When you then add lemon juice, here’s what happens:
- Acid + dairy reaction: The citric acid in lemon juice lowers the pH of the cream.
- Protein coagulation: Casein proteins in the cream respond to the acid by unfolding and lightly clumping together, creating a delicate network.
- Stabilization: This protein network traps fat and water in place, giving the mixture a thick, custard-like texture once cooled.
Unlike gelatin (which sets by forming a gel network as it cools), lemon posset relies purely on the natural acid–protein reaction. The sugar helps balance flavor and also contributes to the smooth mouthfeel by interfering with large protein clumps, keeping the set silky instead of grainy.
After learning the science behind lemon posset, you’ll realize you can actually use almost any citrus fruit—like oranges, limes, or even grapefruits—to make posset. 🍊🍋🍈 Curious? Check out my orange posset recipe here: Orange Posset Recipe
Tips for making lemon posset:
🍋 Ingredient Tips
- Use fresh lemon juice – bottled juice can taste flat and sometimes doesn’t have enough acidity to set the cream.
- Balance sweetness and tartness – The ratio of lemon juice to heavy cream is crucial for achieving the proper texture, while the amount of sugar can be adjusted to your taste. You can taste as you cook and tweak the sugar slightly, depending on whether your lemons are particularly tart or sweet.
🥛 Cream Tips
- Heavy cream only – don’t substitute with half-and-half or milk; they won’t set properly. This is because lemon posset relies on the high fat content in heavy cream (around 36–40%) to thicken when it reacts with the acid from the lemon juice.
- Simmer, don’t boil – bring cream and sugar just to a gentle boil, then simmer for 5 minutes to activate the thickening process without scorching.
🔬 Cooking Tips
- Cooking Time: After the sugar dissolves, let the cream mixture come to a gentle boil and keep it bubbling steadily (not furiously) for about 5 minutes. The liquid should look slightly thicker and coat the back of a spoon. If you dip a spoon in and run your finger across the back, the line should hold for a second instead of running right off.
- Turn Off Heat Before Lemon Juice – Adding lemon juice while the cream is still on high heat can cause it to curdle too quickly, forming lumps instead of a smooth custard. By removing the cream from the heat first, you allow the acid to thicken the cream gently, giving the posset a silky, smooth texture.
- Add vanilla extract after turning off the heat – If you add vanilla extracting while simmering, the flavor may evaporate or turn slightly bitter, so it’s best to add it at the end when the mixture is hot but not bubbling. (If using vanilla pods, add them at the beginning of cooking instead.)
- Don’t rush cooling – let the cream cool 5 minutes after adding lemon juice before pouring into lemon peels or ramekins; this prevents separation.
❄️ Serving & Storage Tips
- Chill long enough – at least 4 hours or overnight for the best texture.
- Serve cold – garnish with berries, candied peel, or a thin cookie for contrast.
- Store properly – covered in the fridge, posset lasts about 3 days.
Equipment
- Measuring cups & spoons (for accurate ingredient amounts.)
- Knife (to cut the lemons in half.)
- Citrus juicer or Potato ricer (to squeeze juice from the lemons.)
- Fine mesh strainer (to strain out seeds/pulp from the juice.)
- Spoon (to carefully scoop out the lemon flesh.)
- Small saucepan (to heat the cream and sugar.)
- Lemon zester (to garnish or add zest to the posset)
- Spatula (to stir the cream mixture.)
- Refrigerator (to set the posset.)
- kitchen torch (to add the crispy caramel top)
Ingredients
- 3 lemons (cut into halves, for juice and peel cups)
- 1½ cup heavy whipping cream
- ½ cup sugar
- ⅓ cup freshly squeezed lemon juice (from the lemons above)
- ½ tsp teaspoon vanilla extract (optional)
Instructions
1. Cut the 3 lemons in half crosswise.
2. Gently scoop out the lemon flesh with a spoon, taking care not to tear the peel. If a peel does break, no worries—you can still pour the posset mixture into small ramekins or bowls instead.
3. Place the lemon peels securely on a muffin tin, plate, or any stable surface. I used the lid of an ice ball tray, which held the lemon cups upright and prevented the posset mixture from spilling.
4. Squeeze the juice from the lemon flesh and strain out the seeds. Measure out ⅓ cup for the posset, and store any extra juice in a container for future recipes.
5. In a saucepan, add the heavy cream, sugar, and the zest of 1 lemon. Heat gently over medium heat, let it simmering for about 5 minutes, don’t let it boil over. If you dip a spoon in and run your finger across the back, the line should hold for a second instead of running right off, the base is ready.
6. Take the pan off the heat, then stir in the reserved ⅓ cup of lemon juice. If desired, add ½ teaspoon of vanilla extract for extra flavor.
7. Pour the posset mixture carefully into the hollowed lemon halves. Refrigerate at least 4 hours, or until fully set.
8. Garnish with a little zest, a mint leaf, or fresh berries if desired. Enjoy scooping the creamy posset right out of the lemon peel cups! 🍋🥄
To add a crispy caramel top:
9. Sprinkle about 1 teaspoon of granulated sugar evenly over the surface of each posset.
10. Use a kitchen torch to gently melt and caramelize the sugar until it turns golden.
11. Let the caramel layer cool and harden for 1–2 minutes, then crack through it with a spoon to enjoy.
My Other Dessert Recipes You will also like:
Lemon Posset
Equipment
- Measuring cups & spoons (for accurate ingredient amounts.)
- Knife (to cut the lemons in half.)
- Citrus juicer or Potato ricer (to squeeze juice from the lemons.)
- fine mesh strainer (to strain out seeds/pulp from the juice.)
- spoon (to carefully scoop out the lemon flesh.)
- Small saucepan (to heat the cream and sugar.)
- Lemon zester (to garnish or add zest to the posset)
- spatula (to stir the cream mixture.)
- Refrigerator (to set the posset.)
- kitchen torch (to add the crispy caramel top)
Ingredients
- 3 lemons (cut into halves, for juice and peel cups)
- 1½ cup heavy whipping cream
- ½ cup sugar
- ⅓ cup freshly squeezed lemon juice (from the lemons above)
- ½ tsp teaspoon vanilla extract (optional)
Instructions
- Cut the 3 lemons in half crosswise.
- Gently scoop out the lemon flesh with a spoon, taking care not to tear the peel. If a peel does break, no worries—you can still pour the posset mixture into small ramekins or bowls instead.
- Place the lemon peels securely on a muffin tin, plate, or any stable surface. I used the lid of an ice ball tray, which held the lemon cups upright and prevented the posset mixture from spilling.
- Squeeze the juice from the lemon flesh and strain out the seeds. Measure out ⅓ cup for the posset, and store any extra juice in a container for future recipes.
- In a saucepan, add the heavy cream, sugar, and the zest of 1 lemon. Heat gently over medium heat, let it simmering for about 5 minutes, don’t let it boil over. If you dip a spoon in and run your finger across the back, the line should hold for a second instead of running right off, the base is ready.
- Take the pan off the heat, then stir in the reserved ⅓ cup of lemon juice. If desired, add ½ teaspoon of vanilla extract for extra flavor.
- Pour the posset mixture carefully into the hollowed lemon halves. Refrigerate at least 4 hours, or until fully set.
- Garnish with a little zest, a mint leaf, or fresh berries if desired. Enjoy scooping the creamy posset right out of the lemon peel cups! 🍋🥄
To add a crispy caramel top:
- Sprinkle about 1 teaspoon of granulated sugar evenly over the surface of each posset.
- Use a kitchen torch to gently melt and caramelize the sugar until it turns golden.
- Let the caramel layer cool and harden for 1–2 minutes, then crack through it with a spoon to enjoy.
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