Lemon Posset in Lemon Shells: A Simple Dessert

Lemon posset is a British dessert made by simmering cream with sugar, then setting it with lemon juice into a smooth, tangy pudding. Here, the mixture is served in hollowed lemon halves, turning each portion into an edible-looking cup; the simple method relies on enough cream reduction and fresh lemon juice for a reliable set.

Ingredients

6 medium lemons (about 900 g total), scrubbed and dried
2 cups heavy cream (480 ml; at least 36% milk fat)
⅔ cup granulated sugar (133 g)
6 tablespoons fresh lemon juice (90 ml), strained; usually from 2–3 of the lemons
½ teaspoon finely grated lemon zest (about 1 g), optional
Fresh berries or thin strips of lemon zest, for serving (optional)

Instructions

Prepare the lemon cups. Cut each lemon in half lengthwise, from tip to tip. If a half rocks when placed cut side up, trim a very thin sliver from its rounded underside without cutting through the peel. Over a bowl, use a small spoon to loosen and scoop out the flesh and membranes. Press the pulp through a sieve to collect the juice, then measure 6 tablespoons (90 ml) for the recipe. Save the remaining juice for another use. Scrape the insides of the shells clean, taking care not to puncture them. Set the 12 halves upright in a snug dish or muffin tin so they cannot tip.
Simmer the cream and sugar. Pour the cream into a heavy-based saucepan and add the sugar. Warm over medium heat, stirring until the sugar dissolves. Bring the mixture to a gentle boil, stirring and watching closely so it does not boil over. Lower the heat enough to maintain a steady simmer for 3 minutes, stirring often. The cream should reduce slightly; do not leave it unattended.
Add the lemon. Take the pan off the heat and let the cream stand for 2 minutes. Stir in the measured lemon juice and the optional zest. The mixture may thicken slightly as the acid reacts with the cream. Taste carefully; if you want a sharper flavor, add up to 1 tablespoon (15 ml) more juice, but note that excess juice can make the posset too tart.
Fill the shells. Let the mixture cool for about 10 minutes, stirring once or twice so it remains even. Pour or spoon it into the lemon halves, filling each nearly to the rim. A small jug or measuring cup makes this easier. Wipe any drips from the outside of the shells and return them to their support dish.
Chill until set. Cover the dish loosely without letting the cover touch the filling. Refrigerate for at least 4 hours, or until the centers are softly set and do not flow when gently tilted. For the neatest texture, chill overnight. Keep the possets refrigerated until serving.

Tips

Choose sturdy lemons. Medium lemons with thick, unbroken skins are easier to hollow and stand upright. If the shells are flimsy or uneven, nestle them in a muffin tin for filling and chilling.
Measure the juice. Lemons vary in size and acidity. Use the stated 90 ml rather than relying on the number of fruits, and strain out seeds and pulp for a silky texture.
Watch the simmer. A full rolling boil can make cream foam over or scorch. Use a heavy saucepan, stir frequently, and keep the simmer steady for the full 3 minutes so the cream reduces enough to help the posset set.
Do not rush chilling. The posset needs several hours in the refrigerator. If it is still loose after 4 hours, chill it longer; freezing it to speed the process can produce an icy or uneven texture.

Serving Suggestions

Serve each lemon half cold, placed on a small plate or in a shallow bowl to catch any drips. A few raspberries, blueberries, or sliced strawberries add color and a fresh contrast to the rich cream. Shortbread, crisp biscuits, or thin almond cookies are good alongside, but keep them separate until serving so they stay crisp. For a clean presentation, add a small pinch of lemon zest just before the possets reach the table.

Variations

For a less tart finish, use 5 tablespoons (75 ml) lemon juice and keep the cream simmer time unchanged; the set may be a little softer, so allow a full overnight chill. For a more pronounced citrus aroma, add up to 1 teaspoon (2 g) finely grated zest to the warm cream, then strain before adding the juice if you prefer a completely smooth filling. A small amount of orange or lime juice can replace up to 1 tablespoon (15 ml) of the lemon juice, giving a gentler or more fragrant citrus note, but keep most of the juice lemon for the characteristic flavor and set.

You can also serve the posset in six small glasses instead of lemon shells. Divide the mixture evenly and chill in the same way; this is useful if the lemons are too small, thin-skinned, or awkward to stand upright. The recipe is naturally made without eggs, and no special equipment is required beyond a saucepan, sieve, and spoon.

Storage and Reheating

Keep the filled lemon shells covered in the refrigerator at 40°F (4°C) or colder. Refrigerate them within 2 hours of preparation, and eat within 3 days for the best flavor and texture. Do not leave them sitting at room temperature for more than 2 hours, or more than 1 hour if the room is above 90°F (32°C). Posset is served cold and should not be reheated. Freezing is not recommended because thawing can make the cream grainy or watery.

Frequently Asked Questions

Why has my lemon posset not set?
The most common causes are too little simmering, too much lemon juice, or not enough chilling time. Make sure the cream reaches a steady simmer for 3 minutes, measure the juice, and refrigerate for at least 4 hours. If it is still soft, give it more time in the refrigerator before serving.

Can I make the lemon shells ahead?
Yes. Hollow the lemons and arrange the shells in their support dish up to a day ahead. Cover and refrigerate them, then fill once the cream mixture is ready. They can also be filled the day before serving and kept covered in the refrigerator.

Can I use bottled lemon juice?
Fresh juice is preferable because it gives a brighter flavor and lets you use the emptied lemons as cups. Bottled juice can vary in acidity and flavor, so use the same measured amount and expect a less fresh-tasting result. Do not add extra juice without considering that it can change the set.

Can I use light cream or half-and-half?
They are not reliable substitutes. Posset depends on the high fat content of heavy cream, and lower-fat dairy may remain runny or separate when lemon juice is added. Use heavy cream with at least 36% milk fat for the texture this recipe is designed to produce.

How do I keep the lemon cups from tipping?
Choose a snug dish or muffin tin that holds the halves upright. If needed, trim only a very thin sliver from the underside of a shell to create a flat base; cutting too deeply can make the filling leak.

Can I make the posset without the lemon shells?
Yes. Pour the mixture into six small heatproof glasses or dessert dishes and chill until set. The shells are a serving option rather than a requirement, and glasses are often easier to store and serve.

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