Buzz
If you spotted 'lemon curdled cream' on a dessert menu, you'd likely opt for lava cake instead. Understandably so—'curdled' isn’t the most appealing word. But while unwanted curdling can ruin a dish, some forms are culinary gold. Cheese is a prime example, and this sweet, silky four-ingredient lemon posset is another.
Posset has stood the test of time. Lady Macbeth once used poisoned possets to knock out Duncan’s guards, though back then, it wasn’t the creamy dessert we know today. Instead, it was a warm, spiced concoction of milk curdled with wine or ale.
Today’s version is served chilled and thickened with lemon juice, but the science remains unchanged. Milk and cream contain casein, a protein with a negative charge that keeps molecules from clumping. Introducing an acid like lemon juice or wine adds positively charged hydrogen ions, neutralizing the charge and allowing curds to form.
And that’s really all it takes to make posset. Simply boil heavy cream with sugar, stir in lemon juice, and let it rest until tiny curds develop, creating a luscious, tangy-sweet dessert with a texture reminiscent of crème brûlée. It’s a delight—like key lime pie filling if it were made with lemons, or a silky lemon pudding without the need for cornstarch, flour, eggs, gelatin, or any other thickener.
Lemon posset has been refined for centuries—dating back to Shakespearean times—but I drew inspiration from this streamlined version from Food52. Many recipes call for zesting the fruit or making a syrup, but I wanted to keep things as simple as possible.
Wanting to sneak in a hint of tangerine before citrus season ended, I modified the recipe slightly—using 1/4 cup lemon juice and 2 tablespoons of tangerine juice instead of the 5 tablespoons of pure lemon juice suggested by Food52. Feel free to experiment with different citrus varieties—even key limes would work beautifully.
This recipe is effortless, but it does require vigilance. Heavy cream can contain butterfat globules, which should be strained out to prevent an unappetizing greasy layer on top of your posset. Also, keep a watchful eye on the cream while boiling—dairy can boil over in an instant.
The only thing left to do is enjoy your posset. Fresh raspberries make a perfect pairing with lemon, but you could also swirl in raspberry jam, top it with unsweetened whipped cream, or serve it alongside a shortbread cookie for dipping. Feeling adventurous? Try brûléeing it—but you’ll need a torch (or a trusty broiler) for that.
Lemon-Tangerine Posset
Ingredients:
2 cups heavy cream
2/3 cup sugar
1/4 cup fresh lemon juice
2 tablespoons fresh tangerine juice
Measure out the cream, ensuring any butterfat clumps are strained out. Pour it into a small saucepan with the sugar, then bring to a boil over medium heat, stirring constantly to dissolve the sugar. Let it boil for five minutes before removing from heat and mixing in the juice.
Allow the mixture to cool for 15 minutes, then pour it into four ramekins, teacups, or these little bodega glasses (which I used). Refrigerate for at least two hours, then serve chilled with your choice of toppings.
