Mom's Best Recipes
Recipe

Lemon Posset

A 3-ingredient, no-gelatin lemon dessert that sets in the fridge and tastes like a creamy lemon cloud.

Author By Matt Campbell
4.8
A close-up of lemon posset set in small glass cups, topped with fresh berries and a little lemon zest on a light stone countertop
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Lemon posset is one of those desserts that feels like a magic trick you can eat. You simmer cream and sugar, add lemon, and somehow it turns into this silky, spoonable, bright little pudding after a nap in the fridge. No gelatin. No eggs. No baking. Just a tiny bit of stovetop time and then you let the cold do the work.

If you love lemon desserts but do not want a whole production, this is your move. The flavor is clean and punchy, the texture is rich without being heavy, and it is basically made for weeknights that need a win, dinner parties that need a closer, and moments when you want something sweet but not complicated.

Heavy cream, granulated sugar, fresh lemons, and a microplane arranged on a bright kitchen counter with soft natural light

Why It Works

  • Silky texture without gelatin: The lemon juice naturally thickens the cream mixture as it chills, so you get that lush set with minimal effort.
  • Bright, not flat: Using both lemon juice and a little zest gives you fresh citrus flavor that tastes alive.
  • Make-ahead friendly: It needs chill time anyway, which means you can make it earlier and enjoy your evening later.
  • Elegant with pantry-level effort: Three main ingredients, but it serves like a restaurant dessert when you top it well.

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Storage Tips

Refrigerate: Cover each serving (plastic wrap or lids) and refrigerate for up to 3 days. The surface may weep a tiny bit after day 2, but it still tastes great.

Do not freeze: Freezing can make the dairy split and turn grainy when thawed. This dessert is happiest cold, not frozen.

Transport tip: If you are bringing it somewhere, chill it fully at home, then keep it in a cooler bag with an ice pack. Bring toppings separately and add right before serving.

Common Questions

What is lemon posset?

It is a classic British dessert made by simmering cream and sugar, then adding lemon juice. The acid from the lemon helps the cream thicken and set as it chills, giving you a smooth, spoonable custard-like texture without eggs or gelatin.

A hand pouring warm lemon posset mixture from a small saucepan into clear serving glasses on a tidy kitchen counter

Why did my posset not set?

  • Not simmered long enough: You want a gentle simmer and a couple minutes of bubbling so it slightly reduces.
  • Too little lemon juice: The acid is part of the setting process. Be sure to measure it.
  • Not chilled long enough: Give it at least 4 hours, and overnight is even better.
  • Lower fat dairy: Use heavy cream. Half-and-half may not set reliably.

How do I avoid curdling or a grainy texture?

Keep it to a gentle simmer, not a hard boil, and whisk the lemon juice in slowly off the heat. If you want extra insurance, strain before pouring.

Can I use bottled lemon juice?

Fresh is best here. Bottled lemon juice is often standardized for acidity, but it can still taste flatter than fresh. If bottled is all you have, it can work, but add a little zest to help the flavor.

Is lemon posset the same as lemon mousse?

Not quite. Mousse is usually aerated with whipped cream or eggs. Posset is denser, silkier, and sets from the lemon and reduction, not from whipping or gelatin.

Can I make it in lemon halves?

Yes. It is adorable for brunch, showers, or a little dinner party moment. Scoop out the lemon flesh, level the bottoms so they sit flat, then pour in the mixture. Chill in a muffin tin so they do not tip.

The first time I made lemon posset, I kept waiting for the “real step” to show up, like surely I needed gelatin or egg yolks or something that would punish me if I looked away. But it is truly that simple. Now it is my favorite low-drama dessert for when I want something that tastes bright and cozy at the same time. Also, it is a great reminder that the fridge is basically an unpaid sous chef.