French-Style Strawberry Mousse with Joconde Sponge

Strawberry mousse is one of my favorite French desserts. It has a light, creamy texture with the fresh flavor of strawberries, while Italian meringue gives the mousse a smooth and delicate finish.

For this cake, I place a thin layer of joconde or genoise sponge at the base and arrange fresh strawberry slices around the outside. Once the mousse is set, the strawberries become part of the decoration, giving the cake a beautiful finish without requiring complicated piping.

I prefer using frozen strawberries for the purée because they are convenient and available year-round. After thawing, I blend and strain them for a smooth mousse. When strawberries are in season, fresh berries are beautiful for decorating the outside and top of the cake.

This is an elegant dessert, but once the individual components are prepared, assembling it is surprisingly straightforward.

eYield:

One 8 in round cake

Supplies:

Stand mixer or hand mixer machine
Mixing bowl medium size
Ring mold for mousse cake
Acetate
Plastic wrapping
Cake board
saucepan
Spatula
Whisk
Scale

Yield

Arrange the strawberries slices on the side of the ring mold.

One 8-inch (20 cm) mousse cake

Ingredients

Strawberry Mousse

350g strawberry purée
200g prepared Italian meringue
350ml 35% heavy cream
14g powdered gelatin
or 7 gelatin leaves*
60ml cold water, if using powdered gelatin

Italian Meringue

100g egg whites
200g granulated sugar
50ml water

For Assembly

1 thin 8-inch layer of joconde or genoise sponge
Fresh strawberries, thinly sliced, for the sides
Fresh strawberries for garnish
Apricot glaze or miroir, as needed

Secure the bottom of the ring mold with cake board and plastic.

Using frozen strawberries: Start with approximately 400g frozen strawberries. Thaw, purée, and strain, then measure 350g finished purée for the recipe.

Prepare the Cake Ring

Place an 8-inch cake ring on a cake board and securely cover the bottom with plastic wrap.

Line the inside of the ring with an acetate strip.

Arrange evenly sized, thin strawberry slices around the inside edge of the ring, with the cut sides facing outward.

Place the prepared sponge cake in the bottom of the ring.

Refrigerate while preparing the mousse.

Strain out the seeds with China cap/chinoise

Prepare the Strawberry Purée

Blend the strawberries until completely smooth.

For a more refined mousse, pass the purée through a fine-mesh strainer or chinois to remove the seeds. Use the back of a ladle or spatula to gently press the purée through the strainer.

Measure 350g and set aside.

Prepare the Gelatin

Gelatin Note: This recipe was originally developed using 7 gold gelatin leaves at 2g each (14g total). For consistency and easier measuring, the recipe uses 14g powdered gelatin.

If Using Gelatin Leaves

Soak the gelatin leaves in plenty of cold water until softened. Remove and gently squeeze out the excess water.

If Using Powdered Gelatin

Sprinkle 14g gelatin over 60ml cold water and allow it to bloom before using.

Gently warm a small portion of the strawberry purée and dissolve the bloomed gelatin completely into it.

Do not boil the gelatin.

Stir this mixture back into the remaining strawberry purée.

Prepare the Italian Meringue

Place the egg whites in the bowl of a stand mixer.

Combine the sugar and water in a saucepan and cook the syrup to approximately 115°C (239°F).

Begin whipping the egg whites, then slowly pour the hot syrup into the whites while continuing to whip.

Continue whipping until the meringue is glossy and holds firm peaks.

Measure 200g Italian meringue for the mousse.

Prepare the Whipped Cream

Whip the cold 35% cream until it reaches soft to medium peaks.

I would change your original instruction from stiff peaks here. For mousse, slightly softer whipped cream is generally easier to fold into the fruit mixture without losing as much volume.

Make the Strawberry Mousse

Make sure the strawberry-gelatin mixture is cool but has not begun to set.

Gently fold the Italian meringue into the strawberry purée in several additions.

Fold in the whipped cream until the mousse is smooth and evenly combined.

Work gently to preserve as much air as possible.

Assemble

Pour the strawberry mousse into the prepared cake ring over the sponge.

Gently spread the mousse to fill the spaces around the strawberry slices and smooth the surface.

Freeze for at least 2 hours, or until sufficiently firm to unmold cleanly.

Remove the cake ring, plastic wrap, and acetate.

Lightly brush the exposed strawberries with apricot glaze or miroir to give them shine and help prevent them from drying.

Decorate with fresh strawberries.

For especially clean portions, cut the mousse cake while it is firm and partially frozen, then allow the slices to soften appropriately before serving.

Pastry Technique — Why This Mousse Works

This recipe combines three important components:

Strawberry purée provides the fruit flavor and acidity.

Italian meringue adds sweetness, volume, and a light, smooth texture.

Whipped cream gives the mousse richness while keeping it airy.

Gelatin provides enough structure for the mousse to hold its shape when unmolded and sliced.

Together, they produce something much lighter than buttercream or cheesecake but stable enough to use in a modern mousse cake.

Enjoy refreshing moments with French dessert

Baking with Confidence

Strain the purée for a refined texture. It takes a little extra time, but removing the strawberry seeds produces a much smoother mousse.

Don't add gelatin directly to a very cold purée. Dissolve it first in a small amount of gently warmed purée, then combine it with the remainder.

Watch the temperatures. If the fruit mixture is too warm, it can deflate or melt the whipped cream. If it's too cold, the gelatin can begin setting before everything has been folded together.

Fold rather than whisk. You've spent considerable effort putting air into the meringue and cream. Whisking enthusiastically at the end would be a rather efficient way of undoing your own work.

Enjoy your French Dessert Strawberry mousse!

Strawberry Mousse Cake