Lemon posset is the culinary equivalent of a magic trick: three ingredients, five minutes of stirring, and a few hours in the fridge later, you have a dessert that tastes like it came from a Michelin-starred pastry kitchen. It's a study in contrast—the sharp, mouth-puckering lemon cutting through the rich, velvety cream, creating a balance that's both refreshing and indulgent.
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The science is beautifully simple. The acid in the lemon juice gently denatures the proteins in the cream, causing it to thicken into a soft-set custard without any eggs or gelatin. It's foolproof, almost impossible to curdle, and forgiving enough for a weeknight treat or a dinner party finale.
This recipe is my go-to when I want maximum impact with minimal effort. It's the dessert equivalent of a well-tailored suit—elegant, timeless, and surprisingly easy to pull off. Let's get started.
Why You'll Love This Recipe
About the Ingredients
2 cups (480 ml) heavy cream (35% milk fat)
The backbone of the posset. Use full-fat heavy cream for the best set; light cream or half-and-half will yield a thinner result.
1/2 cup (100 g) granulated sugar
Regular white sugar dissolves cleanly. For a deeper flavor, try light brown sugar, but reduce the amount to 1/3 cup.
1/2 cup (120 ml) fresh lemon juice (about 3-4 lemons)
Freshly squeezed is non-negotiable—bottled juice has a flat, bitter taste. Roll the lemons on the counter before juicing to get more juice.
1 tablespoon lemon zest (optional, for garnish)
Adds a pop of color and extra citrus aroma. Use a microplane to avoid the bitter white pith.
Tips & Tricks
Use cold cream
It whips and sets better than room-temperature cream.
Strain the lemon juice
This removes pulp and seeds, ensuring a silky-smooth texture.
Don't over-stir
Once the sugar dissolves and the mixture comes to a boil, remove it from heat immediately—overheating can cause separation.
Chill for at least 4 hours
The posset needs time to set properly. Overnight is even better.
Pro Tips
Step-by-Step Instructions
1. Combine cream and sugar
In a medium saucepan, stir together the heavy cream and sugar. Heat over medium heat, stirring constantly, until the sugar is fully dissolved and the mixture is hot but not boiling—about 3-4 minutes. You'll know it's ready when the sugar granules are no longer visible and the cream is steaming.
2. Bring to a boil
Increase the heat to medium-high and bring the cream mixture to a rolling boil. Boil for exactly 2 minutes, stirring occasionally to prevent scorching. The mixture will thicken slightly and bubble up—this is the key to a proper set.
3. Remove from heat and add lemon juice
Take the saucepan off the heat and let it cool for 1 minute. Pour in the lemon juice and stir gently but thoroughly. The mixture will thicken immediately as the acid reacts with the cream—don't panic, that's the magic.
4. Strain and pour into ramekins
Set a fine-mesh sieve over a large measuring cup or bowl and pour the posset through to catch any lumps. Divide the mixture evenly among 6 small ramekins or glasses (about 1/2 cup each).
5. Chill until set
Place the ramekins on a tray and refrigerate for at least 4 hours, or overnight, until the posset is firm and wobbly like a panna cotta. The surface should be smooth and set when you gently shake the dish.
6. Garnish and serve
Before serving, top each posset with a sprinkle of lemon zest and, if desired, a few fresh berries or a sprig of mint. Serve chilled.
Delicious Variations
Lavender Lemon Posset
Infuse the cream with 1 teaspoon dried culinary lavender while heating; strain it out before adding the lemon juice.
Vanilla Bean Posset
Split a vanilla bean and scrape the seeds into the cream before boiling; remove the pod after straining.
Berry Swirl Posset
After pouring into ramekins, drop a teaspoon of raspberry or strawberry puree into each and swirl with a toothpick.
How to Store Lemon Posset Recipe
Refrigerator
Covered, the possets will keep in the fridge for up to 3 days. The texture may become slightly firmer, but that's fine.
Freezer
Possets can be frozen for up to 1 month. Thaw in the fridge overnight before serving. The texture may be slightly icy, so it's best to enjoy them fresh.
Reheating
This dessert is served cold, so no reheating needed. If frozen, thaw in the fridge.
Frequently Asked Questions
Q: Can I use bottled lemon juice?
No, bottled lemon juice has a flat, bitter taste and lacks the fresh acidity needed to set the posset properly. Always use freshly squeezed lemons.
Q: Why did my posset not set?
Your posset may not have boiled long enough, or you used cream with too low fat content. Ensure you boil for a full 2 minutes and use heavy cream with at least 35% milk fat.
Q: Can I make this vegan?
Yes, substitute the heavy cream with full-fat coconut cream (the solid part of a can of coconut milk) and use a vegan sugar. The coconut cream will set similarly, and the lemon flavor pairs beautifully.
Q: How long does lemon posset last?
In the fridge, covered, lemon posset will keep for up to 3 days. After that, the texture may begin to weep.
Q: Can I reduce the sugar?
You can reduce the sugar to 1/3 cup, but the posset will be more tart and may set slightly softer. It's best to keep at least 1/3 cup to balance the acidity.
If you've never tried making posset, now's the time. It's the ultimate low-effort, high-reward dessert—perfect for impressing guests or treating yourself. Give it a whirl and let me know how it turns out in the comments below!
Lemon Posset Recipe
Lemon Posset is a silky, 3-ingredient British dessert that sets in the fridge—no eggs, no oven, just bright citrus cream.
🧂 Ingredients
- 2 cups (480 ml) heavy cream (35% milk fat)
- 1/2 cup (100 g) granulated sugar
- 1/2 cup (120 ml) fresh lemon juice (about 3-4 lemons)
- 1 tablespoon lemon zest (optional, for garnish)
📋 Instructions
- 1Combine cream and sugar — In a medium saucepan, stir together the heavy cream and sugar. Heat over medium heat, stirring constantly, until the sugar is fully dissolved and the mixture is hot but not boiling—about 3-4 minutes. You'll know it's ready when the sugar granules are no longer visible and the cream is steaming.
- 2Bring to a boil — Increase the heat to medium-high and bring the cream mixture to a rolling boil. Boil for exactly 2 minutes, stirring occasionally to prevent scorching. The mixture will thicken slightly and bubble up—this is the key to a proper set.
- 3Remove from heat and add lemon juice — Take the saucepan off the heat and let it cool for 1 minute. Pour in the lemon juice and stir gently but thoroughly. The mixture will thicken immediately as the acid reacts with the cream—don't panic, that's the magic.
- 4Strain and pour into ramekins — Set a fine-mesh sieve over a large measuring cup or bowl and pour the posset through to catch any lumps. Divide the mixture evenly among 6 small ramekins or glasses (about 1/2 cup each).
- 5Chill until set — Place the ramekins on a tray and refrigerate for at least 4 hours, or overnight, until the posset is firm and wobbly like a panna cotta. The surface should be smooth and set when you gently shake the dish.
- 6Garnish and serve — Before serving, top each posset with a sprinkle of lemon zest and, if desired, a few fresh berries or a sprig of mint. Serve chilled.
Liam writes about personal finance for young professionals, covering budgeting, saving, and investing basics. He focuses on debunking myths and building long-term financial habits.
