Lime Posset Recipe

Bright, silky lime posset served in hollowed lime shells and topped with toasted Swiss meringue and graham cracker crumbs. An easy yet elegant citrus dessert perfect for entertaining.

If you are looking for an easy dessert recipe that looks like it came from a restaurant but only takes a little time and simple ingredients to pull off, this creamy lime posset is it. Served in hollowed lime shells and finished with toasted Swiss meringue and graham cracker crumbs, it is a showstopper for any dinner party, special occasion, or summer gathering.

Why This Recipe Works

• The lime shell method is practical and stunning. Using hollowed lime halves as cups means no extra dishes, built-in portion control, and a presentation that gets big smiles every time.
• Cream and citrus do all the work. The acid in fresh lime juice causes the cream mixture to thicken naturally. No gelatin, no special steps, no mini food processor required.
• The Swiss meringue topping adds contrast. The light, glossy meringue against the dense, tangy posset is what makes this feel like a special moment dessert rather than a weeknight fridge situation.
• It is almost entirely make-ahead. The posset sets overnight, so the hardest part of this recipe is just remembering to start it the day before.

What Is a Posset and How Does It Work?

A posset is one of the oldest English desserts on record, with roots going back to the 15th century. It started as a warm drink made by curdling hot milk with citrus juice, wine, or ale. By the 16th century, it had shifted into something closer to a spiced cream dessert, and by the 19th century, it had become the cold, set cream dessert we know today.

The modern version uses just three core ingredients: heavy cream, sugar, and citrus juice. No gelatin, no eggs, no special equipment. The science is simple. When you bring the cream and sugar to a gentle boil and hold it there for a few minutes, the cream reduces slightly, and the fat concentration increases. When you whisk in the citrus juice, the acid reacts with the proteins in the cream and causes it to thicken. As it chills, that reaction sets into a firm, sliceable texture that holds its shape in the lime shell.

The result is a creamy dessert with a silky, dense texture somewhere between a panna cotta and a citrus curd. Tangy, rich, and surprisingly light on the palate for how little time it takes to make.

Ingredients

Lime Posset

• Large limes (halved and hollowed to use as shells)
• Heavy cream (sometimes called double cream in UK recipes)
• Granulated sugar
• Fresh lime juice
• Lime zest

Swiss Meringue

• Egg whites
• Granulated sugar
• Cream of tartar

Garnishing

• Graham cracker crumbs
• Extra lime zest

Substitution Notes:

This recipe works because of the chemical reaction between the heated cream and sugar thickened by the lime juice. You CANNOT substitute the cream and sugar for this recipe. 

If you do not want to use lime shells, pour into small glasses or small ramekins instead. Cover with plastic wrap and chill the same way.

Instructions

Step 1: Prepare the Lime Shells

Halve each lime and use a paring knife to cut around the inside edge to release the fruit. Scoop out the lime flesh and reserve it for juicing. You need 6 tablespoons of fresh lime juice total, so squeeze and measure from the pulp as you go.

Leave a thin layer of membrane on the inside of each shell. This acts as a barrier between the cream filling and the bitter white pith, which will prevent the posset from picking up any bitterness as it sets.

Set the hollowed lime shells upright in a muffin tin or nestle them in small jars to keep them stable while you fill and chill them.

Step 2: Make the Posset Base

Add the heavy cream, sugar, and lime zest to a medium saucepan over medium heat. Stir gently as it heats. Once it reaches a gentle boil or gentle simmer, keep it there for 5 full minutes, stirring occasionally. Do not skip or shorten this step. The sugar dissolves fully during this time, and the cream reduces slightly, which is what allows it to set later.

After 5 minutes, remove the pan from the heat. If you want a completely smooth posset, strain out the lime zest through a fine mesh sieve. Cool slightly for 5 to 10 minutes before adding the juice.

Step 3: Add the Lime Juice and Pour

Pour the lime juice slowly into the warm cream mixture while whisking. You will notice the mixture begin to thicken as you add the citrus juice. This is the reaction happening in real time. Keep whisking until it is fully combined and slightly thickened.

Carefully pour the posset into each lime shell. Fill them close to the top. If you see bubbles forming on the surface, use a toothpick to pop them before refrigerating.

Step 4: Chill

Transfer the filled lime shells or filled jars to the refrigerator. Chill for at least 4 hours, but overnight is best. The posset needs time to fully set before you add any toppings. Do not rush this step.

Once set, you can serve them plain or continue with the Swiss meringue topping below.

Step 5: Make the Swiss Meringue

Set up a double boiler by placing a clean bowl over a pot of simmering water on low heat. The bottom of the bowl should not touch the water.

Add the egg whites, granulated sugar, and cream of tartar to the bowl. Whisk continuously while the mixture heats. You are waiting for two things: for the sugar to dissolve completely, and for the temperature to reach approximately 160°F. Use an instant-read thermometer to check.

The mixture will look thin and glossy at this stage. Transfer the warm mixture to a stand mixer or use a hand mixer with a clean bowl. Whip on medium-high heat until the meringue forms stiff, glossy peaks. The outside of the bowl should feel cool before you stop mixing.

Step 6: Assemble and Serve

Pipe or scoop the Swiss meringue onto the top of the possets. Use a kitchen torch to toast the meringue until golden. Finish with a pinch of graham cracker crumbs and extra lime zest.

Torch just before serving for the best texture. The toasted meringue softens once refrigerated again, so do not torch it in advance if you can help it.

Tips and Variations

Make it ahead. The posset itself is the best place to start the night before a dinner party. Set them in the fridge overnight and add the meringue right before you serve. This turns a multi-step recipe into a nearly stress-free dessert.

Best timeline for serving. These are best eaten within 24 to 36 hours. After that, the lime shells can begin to dry out or lose their shape, and the texture of the posset starts to change.

Skip the meringue for a simpler version. The posset on its own with just graham cracker crumbs and extra lime zest is a completely satisfying, free dessert from fussy toppings that still looks polished. I also love a simple whipped cream over the top as well.

Want a key lime pie feel? Lean into it. Sprinkle a generous layer of graham cracker crumbs over the top of the possets before torching, use a little more zest, and you are essentially making key lime pie possets in miniature.

Frequently Asked Questions

More Recipes To Try

Lemon Posset

Orange Posset

Banana Pudding Bars