This light and airy lemon mousse is made with a classic French technique and just five simple ingredients, creating a silky, elegant dessert bursting with bright citrus flavor.
It’s easy to make ahead, making it perfect for holidays, dinner parties, or any occasion that calls for a refreshing, impressive treat.
A classic mousse may seem complicated in theory, but it’s actually one of the simplest desserts to make at home with a restaurant-quality flair. I love this lemon mousse for an easy dinner party dessert because it takes less than 30 minutes to prep and needs to set in the fridge for a few hours before serving. This leaves time for me to prep other dishes.
I break down all the steps of the classic French method, from making the cooked egg yolk and sugar mixture (also called a sabayon) to whipping the egg whites and cream correctly to refrigerating the final mousse until it’s soft and creamy. Lemon is my flavor of choice here for its bright, tangy flavor, but you can easily flavor this mousse with vanilla, chocolate, almond, pumpkin, raspberry, and so many other flavors!
Table of Contents
Why you’ll love this recipe
- 5-ingredient dessert – Nothing fancy is required here, you may even already have the ingredients right at home!
- Classic French dessert to impress – This may seem complicated, but with simple steps it’s prepped and ready to chill in about 30 minutes before serving.
- Perfect for any time of the year – Delicious for spring, summer, or the holidays. No matter the occasion, this mousse is a delightful dessert to enjoy.
Key Ingredient Notes
- Fresh lemon juice – Make sure it’s freshly squeezed, not pre-bottled, for the best flavor.
- Granulated sugar is the best for making a mousse as it provides clean sweetness without adding extra moisture.
- Large egg yolks create a rich, creamy base for lemon mousse and help emulsify the ingredients for a smooth texture. They also add structure and stability, giving the mousse its luscious, velvety consistency.
- Heavy cream is whipped and folded into the mousse to create its light, airy texture. It also adds richness and a smooth, creamy mouthfeel, balancing the bright lemon flavor.
- Egg whites – Make sure your egg whites are room temperature. This makes whipping to a light, airy texture easier.
- Finely grated lemon zest adds a nice burst of extra lemon flavor to complement the freshly squeezed lemon juice.
- Vanilla extract – Caramel and floral notes that also complement the tart lemon and cream.
- Pinch of fine sea salt – A little pinch is essential in any baked good to brighten all of the other flavors.
How to make lemon mousse
- Whisk together the lemon juice, ¼ cup of the sugar, egg yolks, lemon zest, and salt in a medium heatproof bowl until smooth.
- Set the bowl over a saucepan of gently simmering water, making sure the bottom of the bowl does not touch the water.
- Cook, whisking constantly, until the mixture thickens and reaches about 170°F. The mixture should be pale, glossy, and thick enough to coat the back of a spoon.
- Remove from heat and whisk in the vanilla extract. Set aside to cool to room temperature, whisking occasionally to prevent a skin from forming, or place plastic film over the mixture, making certain the mixture is in contact with the plastic film.
Test the sabayon
You’ll know when this is done by running your fingertip on the back of a coated spoon. If the mixture doesn’t run together and holds it’s shape, it’s ready.
- Whip the cold heavy cream in a separate bowl until soft peaks and refrigerate until ready to use.
- Beat the room-temperature egg whites in another clean bowl until foamy.
- Gradually add the remaining ¼ cup sugar and continue beating until the whites hold soft, glossy peaks.
- Once the lemon base has cooled completely, gently fold the whipped cream into the lemon mixture in two additions, loosening the base while keeping it airy.
Cool the lemon base completely
Make sure the base is cooled completely before adding the whipped cream and egg whites. You can even make this a day in advance and keep it in the refrigerator.
- Fold in the whipped egg whites last, using a light hand and stopping as soon as no streaks remain.
- Divide the mousse evenly among six serving glasses or coupes. Cover and refrigerate for at least 2 hours before serving.
- Top with whipped cream, grated lemon zest or zest curls, or fresh berries and mint leaves.
Serving tip
If you want a cute way to serve this mousse, you can scoop out the pith of halved lemons and scoop and chill the mousse in the lemon halves. This is called lemon posset in French cooking.
Expert Tips
- Be sure to use room temperature egg whites. It makes it easier to whip them to a greater volume and creates a lighter mousse. You can quickly bring the egg whites to room temperature by leaving the separated egg whites at room temperature while making the lemon-egg yolk base.
- If you accidentally cook the egg yolks slightly when making the base mixture (also called a sabayon in French cooking), you can strain the mixture through a fine mesh sieve to remove any cooked egg bits before chilling completely.
- The lemon base must be fully cooled before folding in the whipped cream and egg whites. If it’s not, you will deflate the mixture and also cook the egg whites which will ruin the texture.
- No need to use gelatin. This mousse sets softly without it and should remain light and spoonable rather than firm.
- Be sure to chill the mousse for at least 2 hours before serving. This is key to allowing the mousse to set correctly to a creamy, luscious texture.
Storage
Any leftover French lemon mousse will keep refrigerated for up to 1 day. We don’t recommend freezing the mousse, as it will change the texture once it thaws.
This creamy lemon mousse is a great make-ahead dessert for any celebration. It needs to set for several hours, so making it the day before also works well.
FAQs
Yes, it’ll be a firmer mousse. Our recipe for lemon mousse doesn’t use gelatin and is so delicious.
Make sure you cook the egg and sugar mixture until it’s thick enough and cool completely to set. When folding in the whipped cream, don’t over-mix or you will deflate the mousse and it could be runny in texture.
Yes, you can easily use lime juice, grapefruit juice, or your favorite citrus juice. Just be sure to squeeze it fresh!
More lemon dessert recipes
Lemon Mousse
Ingredients
- ½ cup (120 g) fresh lemon juice
- ½ cup (100 g) granulated sugar divided
- 4 large egg yolks
- 1 cup (240 g) heavy cream cold
- 2 large egg whites room temperature
- 1 tablespoon finely grated lemon zest
- 1 teaspoon vanilla extract
- Pinch of fine sea salt
Instructions
Make lemon base:
- In a medium heatproof bowl, whisk together the lemon juice, ¼ cup of the sugar, egg yolks, lemon zest, and salt until smooth.
- Set the bowl over a saucepan of gently simmering water, making sure the bottom of the bowl does not touch the water.
- Cook, whisking constantly, until the mixture thickens and reaches about 170°F. The mixture should be pale, glossy, and thick enough to coat the back of a spoon.
- Remove from heat and whisk in the vanilla extract. Set aside to cool to room temperature, whisking occasionally to prevent a skin from forming, or place plastic film over the mixture, making certain the mixture is in contact with the plastic film.
Make whipped cream:
- In a separate bowl, whip the cold heavy cream to soft peaks and refrigerate until ready to use.
Make the meringue:
- In another clean bowl, beat the room-temperature egg whites until foamy.
- Gradually add the remaining ¼ cup sugar and continue beating until the whites hold soft, glossy peaks.
Make the mousse:
- Once the lemon base has cooled completely, gently fold the whipped cream into the lemon mixture in two additions, loosening the base while keeping it airy.
- Fold in the whipped egg whites last, using a light hand and stopping as soon as no streaks remain.
- Divide the mousse evenly among six serving glasses or coupes. Cover and refrigerate for at least 2 hours before serving.
- Top with whipped cream, grated lemon zest or zest curls, or fresh berries and mint leaves.
⭐️ Did you make this recipe?
Please leave a review and let us know how you liked it!
Tips & Notes
– Any leftover French lemon mousse will keep refrigerated for up to 1 day. We don’t recommend freezing the mousse, as it will change the texture once it thaws.
– This creamy lemon mousse is a great make-ahead dessert for any celebration. It needs to set for several hours, so making it the day before also works well.
Nutrition
