Silky, bright, and just rich enough, this lemon posset is one of those desserts that looks incredibly impressive while being surprisingly simple to make. I love serving it inside hollowed lemon shells for a playful presentation, but the creamy lemon filling is just as beautiful served in small glasses or ceramic bowls.
I recently made this lemon posset for a dinner party, and it was exactly the kind of dessert I wanted after serving a full meal. It is light, fresh, creamy, and citrusy, with enough richness to still feel like a proper dessert.
What I especially love about it for entertaining is that almost everything can be done ahead. When I am already making multiple courses, the last thing I want is to be worrying about dessert while everyone is sitting at the table. I can make these the night before, tuck them into the refrigerator, and essentially forget about them until it is time to serve.
Serving the posset inside the lemons makes it feel extra special with very little additional effort, which is basically my favorite kind of dinner party trick. Hostess with the mostess energy, without actually making my life harder.
⏱️ Total: 4 hours 30 minutes · 🍽️ Yield: 8 to 10 servings · 📊 Level: Easy · 🥗 Diet: Vegetarian
Why You’ll Love Lemon Posset
- It looks far more complicated than it is. Serving the posset inside lemon shells instantly makes a very simple dessert feel restaurant-worthy.
- It is made for entertaining. I actually prefer making it the day before so dessert is completely taken care of before guests arrive.
- The texture is incredible. The cream sets into something silky and spoonable, somewhere between a custard and a very soft panna cotta, without eggs or gelatin.
- It is rich but still refreshing. Fresh lemon cuts through the cream, which makes this especially nice at the end of a larger meal.
Ingredients
- Large lemons: Choose lemons that feel heavy for their size with relatively firm skins. Larger lemons are easier to hollow out and give you more room for the filling.
- Heavy cream: This creates the rich, silky base of the posset.
- Granulated sugar: Sweetens the cream while balancing the tart lemon juice.
- Salt: Just a pinch helps balance the sweetness.
- Vanilla extract: Adds a subtle warmth behind the lemon.
- Fresh lemon juice: This is what gives the posset its brightness and, more importantly, reacts with the cream to help it set.
- Fresh mint: Optional, but a tiny mint leaf makes a beautiful garnish if you are serving the posset inside lemon shells.
How to Make Lemon Posset
- Prepare the lemon shells. Wash and dry the lemons well, then slice them in half lengthwise. Carefully cut around the inside of each lemon and scoop out the pulp, taking your time so you do not puncture the rind.
- Juice the lemon pulp. Squeeze the pulp you removed and reserve the fresh lemon juice for the filling.
- Chill the shells. Place the hollowed lemon halves into a muffin tin or another dish that keeps them upright. Transfer them to the freezer while you prepare the posset.
- Bring the cream to a boil. Add the heavy cream, sugar, salt, and vanilla to a medium saucepan. Bring the mixture to a boil over medium heat, stirring occasionally. Keep a close eye on it because cream can rise very quickly once it begins boiling.
- Simmer the cream. Reduce the heat and allow the cream to simmer for a full 5 minutes, stirring occasionally. You want it to reduce slightly and become a little more concentrated.
- Add the lemon juice. Remove the pan from the heat and allow the cream to cool for a few minutes. Stir in the fresh lemon juice. You should notice the mixture begin thickening almost immediately.
- Fill the lemons. Remove the chilled lemon halves from the freezer and carefully pour the posset mixture into each shell. If you are using glasses, ramekins, or ceramic bowls instead, divide the filling evenly between them.
- Chill until set. Refrigerate the possets for at least 3 to 4 hours, although I prefer making them earlier in the day or the night before. They should be completely chilled and softly set before serving.
- Finish and serve. Add a small mint leaf just before serving, if desired, and serve the possets cold.
Tips and Tricks
Do not rush the simmer. The full 5-minute simmer reduces the cream slightly and is important for getting the final texture right.
Watch your saucepan. Cream goes from calmly simmering to climbing out of the pot surprisingly fast. Once it approaches a boil, stay close.
Be gentle with the lemon shells. I use a small knife first to loosen the inside, then carefully scoop out the pulp. A tiny puncture can cause the filling to leak.
Use a muffin tin. It is the easiest way to keep the lemon halves upright while you fill, transfer, and chill them.
Give the cream a moment before adding the lemon. I like to let it sit off the heat for a few minutes first, rather than adding the juice while the cream is still furiously bubbling.
Make them the day before. This is one dessert where preparing it ahead actually makes hosting easier without sacrificing anything in texture or presentation.
Substitutions
If you do not want to hollow out lemons, skip that step completely and pour the posset into small ramekins, glasses, espresso cups, or any little ceramic bowls you already own.
You can also leave off the mint garnish. I like it primarily for presentation, but the dessert does not need anything added to it.
I would not substitute lower-fat milk or cream here. The fat content of heavy cream is important to the texture and structure of a traditional posset.
Leftovers
Keep leftover lemon posset covered in the refrigerator for up to 3 days.
If you are serving it inside lemon shells, I think the presentation and texture are best within the first day or two. The lemon rind can gradually soften as it sits.
There is no need to reheat this dessert. Serve it straight from the refrigerator.
FAQ
Yes, and I actually recommend it for entertaining. Make the possets, refrigerate them overnight, and garnish right before serving.
Not at all. The lemon shells are purely for presentation. Small glasses, ramekins, espresso cups, or ceramic bowls all work beautifully.
The acidity in the lemon juice reacts with the proteins in the reduced cream, causing the mixture to thicken and set as it chills. That is what makes posset such a surprisingly simple dessert.
The most common issue is not simmering the cream long enough. Make sure it reaches a boil and then gets a full 5-minute simmer before adding the lemon juice. It also needs several hours in the refrigerator to completely set.
Lemon Posset
Ingredients
- 5 large lemons
- 2 cups heavy cream
- 1/2 cup granulated sugar
- Pinch of salt
- 1 teaspoon vanilla extract
- 6 tablespoons fresh lemon juice
- Fresh mint, for garnish, optional
Instructions
- Wash and dry the lemons well. Slice them in half lengthwise, then carefully cut around the inside of each lemon and scoop out the pulp without puncturing the rind.
- Squeeze the removed lemon pulp and measure out 6 tablespoons fresh lemon juice. Set aside.
- Arrange the hollowed lemon halves in a muffin tin or another dish that keeps them upright. Place them in the freezer while you prepare the filling.
- Add the heavy cream, sugar, salt, and vanilla to a medium saucepan. Bring to a boil over medium heat, stirring occasionally and watching carefully so the cream does not boil over.
- Once boiling, reduce the heat and simmer for a full 5 minutes, stirring occasionally.
- Remove the saucepan from the heat and allow the mixture to cool for a few minutes. Stir in the lemon juice. The mixture should begin to thicken almost immediately.
- Remove the lemon shells from the freezer and carefully pour the posset mixture into each shell.
- Refrigerate for at least 3 to 4 hours, or overnight, until completely chilled and set.
- Garnish with a small mint leaf before serving, if desired.
