Easy Lemon Mousse Recipe: Light, Fluffy & Refreshing No-Bake Dessert
This lemon mousse recipe is one of those desserts that feels like sunshine in a glass. It is light and silky, made with real fresh lemon juice, and the flavour is bright and citrusy with a creamy richness that balances it out perfectly. It is the kind of dessert that looks elegant and tastes like you put in a lot more effort than you actually did.
The base is a cooked lemon custard made on a double boiler, which sounds fancy but is actually very straightforward. Once it is chilled, you fold in whipped egg whites and cream and the whole thing becomes impossibly light and airy. The lemon flavour is front and centre — not timid, not sugary, just genuinely fresh and bright.
What I love most about this mousse is that it keeps in the fridge for up to five days, which makes it brilliant for making ahead. If you are a fan of lemon desserts, this one sits right alongside my easy mango mousse and raspberry mousse — or have a browse through all my favourite mousse recipes for more ideas.
Why You Will Love This Recipe
- Made with real fresh lemon juice — the flavour is genuinely bright and citrusy
- Light, airy texture from folded meringue and whipped cream
- Can be made up to 5 days ahead — perfect for entertaining
- Naturally gluten-free
- Works as an elegant dinner party dessert or a simple weeknight treat
- Optional lemon curd fold-in takes the flavour even deeper
- Beautiful served in individual glasses with a swirl of whipped cream on top
Ingredients
- 6 large eggs (3 whole + 3 separated)
- 1 cup + 2 tbsp (215g) granulated sugar, divided
- Zest of 1 lemon
- ½ cup (120ml) fresh lemon juice (about 3–4 lemons)
- ⅛ tsp salt
- ½ cup (120ml) heavy whipping cream
Optional:
- ½ cup homemade lemon curd, folded in at the end for extra lemon depth
- Whipped cream and lemon curd for topping
Ingredient Notes and Substitutions
Eggs — You need 3 whole eggs and 3 separated eggs. The yolks go into the custard base along with the whole eggs, and the whites are whipped into a meringue that gives the mousse its airy lift. Make sure the eggs are at room temperature for better volume when whipping the whites.
Fresh lemon juice — Please use fresh here, not bottled. The flavour difference is significant. You will need about 3–4 lemons depending on their size. Roll them firmly on the counter before cutting — it releases more juice.
Lemon zest — Zest only the bright yellow outer layer, not the white pith underneath which is bitter. A microplane zester gets the finest zest and the most flavour.
Granulated sugar — Divided: 1 cup goes into the custard and 2 tablespoons are added to the egg whites while whipping. Do not reduce the sugar in the custard or it will be too tart.
Heavy whipping cream — Cold cream from the fridge whips to the best volume. Use a chilled bowl and beaters if possible.
Lemon curd — Completely optional but worth doing if you want a more intensely lemony mousse or a larger yield. Fold it in gently at the very end.
Step-by-Step Instructions
Step 1: Make the Lemon Custard Base
In a large heatproof bowl, whisk together the 3 whole eggs, 3 egg yolks, 1 cup of the sugar, lemon zest, lemon juice, and salt until smooth. Set the 3 reserved egg whites aside in a separate bowl.
Step 2: Set Up a Double Boiler
Fill a large saucepan with a few inches of water and bring to a boil. Reduce to a simmer. Set the bowl with the lemon mixture over the saucepan, making sure the bottom of the bowl does not touch the water.
Step 3: Cook the Custard
Stir the lemon mixture constantly with a wooden spoon or heatproof spatula for about 15 minutes until it begins to thicken noticeably. It is ready when it reaches 150°F (66°C) on a digital thermometer — the mixture should coat the back of a spoon.
Step 4: Cool and Chill
Remove the bowl from the heat and leave to rest for 15 minutes. Press a sheet of plastic wrap directly onto the surface of the custard to prevent a skin from forming. Refrigerate for at least 2 hours until completely cold.
Step 5: Whip the Egg Whites
Beat the reserved egg whites on high speed for 1 minute. Add the remaining 2 tablespoons of sugar and continue beating until stiff peaks form — the whites should be glossy and hold a firm peak when you lift the beaters.
Step 6: Fold the Meringue Into the Custard
Gently fold the whipped egg whites into the cold custard in two or three additions using a large rubber spatula. Work slowly with a light hand to keep the air in. The mixture should be pale, light, and fluffy.
Step 7: Whip the Cream
Using the same bowl (rinsed and dried), beat the cold heavy cream on high until stiff peaks form.
Step 8: Fold in the Cream
Gently fold the whipped cream into the lemon mousse mixture. If using lemon curd, fold that in now too. The finished mousse should be light, airy, and pale yellow.
Step 9: Chill and Serve
Spoon or pipe the mousse into individual serving glasses. Chill for at least 30 minutes before serving. Top with a swirl of whipped cream, a spoonful of lemon curd, or a slice of fresh lemon. Serve cold.
Tips for the Best Results
- Stir the custard constantly on the double boiler — do not walk away or it can scramble at the edges
- Use a digital thermometer to confirm the custard reaches 150°F — this is the safest and most reliable check
- Make sure the custard is completely cold before folding in the egg whites and cream, or it will deflate them
- Fold gently — deflating the meringue or whipped cream is the most common mistake; use a light sweeping motion
- Chill your bowl and beaters before whipping the cream for better volume
- Taste the finished mousse before serving and add a little extra lemon zest on top if you want more brightness
- The mousse keeps tightly covered in the fridge for up to 5 days — the flavour actually deepens by day two
Variations and Add-ins
- Lemon curd mousse: Fold in ½ cup homemade lemon curd at the end for an intensely citrusy, richer version
- Lemon mousse cake filling: This mousse makes a stunning filling between sponge cake layers — chill slightly before spreading
- Lemon blueberry mousse: Top each glass with a spoonful of fresh blueberry compote for a beautiful colour contrast
- Lemon raspberry mousse: Layer with fresh raspberries and a little raspberry purée for a fruit-forward twist
- Meyer lemon version: Swap regular lemons for Meyer lemons for a softer, slightly sweeter flavour
- Lemon mousse tart: Spoon into blind-baked tart shells, chill to set, and top with lemon curd for an elegant dessert
What to Serve With It
- Crisp shortbread fingers or lemon butter biscuits on the side
- A spoonful of lemon curd on top for extra richness
- Fresh blueberries, raspberries, or sliced strawberries as garnish
- A light dusting of icing sugar and a thin slice of lemon on the rim of the glass
- Alongside a buttery madeline or sponge finger
- A glass of Prosecco or elderflower cordial for a summer dessert spread
Lemon Mousse
Ingredients
Method
- In a large heatproof bowl, whisk together 3 whole eggs, 3 egg yolks, 1 cup sugar, lemon zest, lemon juice, and salt. Reserve the 3 egg whites separately.
- Set the bowl over a saucepan of simmering water (double boiler). Stir constantly for about 15 minutes until thickened and reaching 150°F (66°C).
- Remove from heat, cool for 15 minutes, then press plastic wrap onto the surface and refrigerate for at least 2 hours until fully cold.
- Beat reserved egg whites on high for 1 minute. Add remaining 2 tbsp sugar and beat to stiff peaks.
- Gently fold meringue into the cold custard in two or three additions.
- In a clean bowl, beat heavy cream to stiff peaks. Fold into the mousse mixture. Fold in lemon curd now if using.
- Spoon into serving glasses. Chill for at least 30 minutes. Top with whipped cream and lemon curd and serve cold.
Notes
- Use fresh lemon juice only — bottled will not give the same bright flavour.
- Make sure the custard is completely cold before folding in the meringue and cream.
- Mousse keeps tightly covered in the fridge for up to 5 days.
- Stir constantly on the double boiler to prevent the eggs from scrambling at the edges.
This lemon mousse recipe is one of those keepers that earns a permanent spot in your dessert rotation. It is bright, creamy, genuinely lemony, and lighter than almost anything else you could put on the table after a meal. The five-day fridge life makes it one of the best make-ahead desserts around — and it tastes even better the next day once the flavours have had time to settle.
Whether you are making it for a dinner party, a holiday spread, or just because you have a bag of lemons on the counter, this mousse always delivers. It is simple enough for a weeknight and impressive enough to serve to guests without apology.
For more mousse recipes you will love:
