Julia Child’s Chocolate Mousse Recipe (Mousse au Chocolat)

This light, rich Julia Child chocolate mousse is made with dark chocolate, butter, orange liqueur, egg yolks beaten to the ribbon stage, and airy whipped egg whites — no cream needed. It takes about 20 minutes of active work, then chills for at least 2 hours. Adapted from pages 604-605 of Mastering the Art of French Cooking, it serves 6-8 and is even better made the day before.

I’ve made this mousse for every dinner party in the last three years. It takes real technique — the ribbon stage, the careful folding — but the result is something no store-bought dessert can touch. The orange liqueur is what makes it: you don’t taste orange, you taste deeper, more complex chocolate.

For Julia’s baked chocolate custard, see her pots de crème.

What Makes Julia Child’s Chocolate Mousse Different?

Most modern chocolate mousse recipes use heavy cream. Julia’s doesn’t. Her version gets all its lightness from beaten egg whites, which gives it a texture that’s closer to a soufflé than a pudding — airy but intensely chocolate.

The other difference is the ribbon stage. Julia has you beat egg yolks and sugar until they form a thick ribbon, then heat the mixture over simmering water to create a sabayon. This is the step most internet recipes skip, and it’s why most internet mousse tastes flat. The sabayon gives Julia’s version a richness and depth that cream alone can’t match.

Finally, the orange liqueur. Julia specifically notes that Grand Marnier is “delicious with chocolate.” It doesn’t make the mousse taste like orange — it makes the chocolate taste more like itself.

What Do You Need for Julia Child’s Chocolate Mousse?

From Mastering the Art of French Cooking, Vol. 1, Pages 604-605. Makes 5 cups, serves 6-8.

For the Egg Yolk Base:

• 4 egg yolks
• ¾ cup superfine sugar
• ¼ cup orange liqueur (Grand Marnier or Cointreau)

For the Chocolate:

• 6 oz semisweet chocolate, chopped
• 4 Tb strong coffee
• 6 oz (1½ sticks) unsalted butter, softened
• Optional: ¼ cup diced candied orange peel

For the Egg Whites:

• 4 egg whites
• Pinch of salt
• 1 Tb sugar

For Serving:

• Crème anglaise or lightly sweetened whipped cream

How Do You Make Julia Child’s Chocolate Mousse?

Step 1: Beat Yolks to the Ribbon

1. Beat yolks and sugar: Use a whisk or electric beater. Continue until thick, pale yellow, and the mixture falls back on itself in a slowly dissolving ribbon.
2. Add orange liqueur: Beat to combine.
3. Heat over simmering water: Set bowl over (not in) barely simmering water. Beat 3-4 minutes until foamy and too hot to touch.
4. Cool over ice water: Beat another 3-4 minutes until cool and ribbon forms again. Mixture should be thick like mayonnaise.

Step 2: Prepare the Chocolate

5. Melt chocolate with coffee: In a small saucepan over hot water. Stir until perfectly smooth.
6. Beat in butter: Add bit by bit, stirring until smooth and creamy.
7. Combine with yolk mixture: Beat chocolate into the egg yolk base.
8. Add candied peel if using.

Step 3: Fold in Whites

9. Beat egg whites with salt: To soft peaks.
10. Add sugar: Beat to stiff, glossy peaks.
11. Lighten the base: Stir one quarter of the whites into the chocolate mixture.
12. Fold in the rest: Gently, preserving volume. This is your mousse texture.

Step 4: Chill and Serve

13. Transfer to serving dish: Individual cups, a large bowl, or a mold.
14. Refrigerate at least 2 hours: Overnight is better.
15. Serve with crème anglaise or whipped cream.

What Are the Most Common Chocolate Mousse Mistakes?

Adding hot chocolate to the egg whites. If the melted chocolate mixture is too warm, it deflates the whites on contact and you lose all the air. Let the chocolate cool until it’s barely warm to the touch — tepid, not hot — before folding.

Skipping the ribbon stage. This is the step that separates Julia’s mousse from every other recipe online. If you just mix yolks and sugar without beating them to a thick, pale ribbon, the mousse will taste flat and one-dimensional. Take the full 3-5 minutes. It matters.

Over-folding the egg whites. Once you stir the first quarter of whites into the chocolate base to lighten it, the rest should be folded gently with a spatula — not stirred, not whisked. Stop the moment you don’t see white streaks. A few small streaks are fine. Over-mixing is not.

Using cheap chocolate. This mousse has six ingredients. The chocolate is the star. Use something you’d eat on its own — Valrhona, Ghirardelli, Lindt. Baking chips won’t give you the same depth.

The Ribbon Stage

Julia’s key technique explained:

Beat egg yolks and sugar until:

1. Color is pale yellow (almost cream)
2. Texture is thick and voluminous
3. When you lift the whisk, mixture falls back in a ribbon
4. The ribbon sits on the surface before slowly dissolving

This takes 3-5 minutes of vigorous beating. Don’t shortcut it.

Recipe Variations

• Molded Mousse: Pour into lightly oiled 6-cup ring mold. Cover with oiled wax paper. Chill 3-4 hours. Unmold and fill center with crème anglaise.
• Charlotte Malakoff Style: Line a cylindrical mold with ladyfingers dipped in orange liqueur. Fill with mousse.
• Rum or Coffee Variation: Substitute rum or Kahlúa for the orange liqueur.
• Raspberry Chocolate Mousse: Fold 1 cup of fresh raspberries into the finished mousse before chilling. The tartness cuts the richness beautifully. Julia doesn’t include this variation but it’s a natural extension.

What Do You Serve With Chocolate Mousse?

• Crème anglaise (vanilla custard sauce)
• Lightly sweetened whipped cream
• Candied orange peel as garnish
• Fresh raspberries
• Shortbread cookies

How To Store

• Refrigerator: Covered, up to 3 days. Flavor actually improves overnight.
• Freezer: Can be frozen 2-3 weeks. Thaw in fridge. Texture is slightly denser.
• Raw egg note: Contains uncooked egg yolks and whites. Use fresh eggs from a trusted source.

Nutrition Facts

Per serving (1/8 of recipe):

• Calories: 420 kcal
• Protein: 5g
• Total Fat: 28g
• Saturated Fat: 16g
• Carbohydrates: 35g
• Fiber: 2g
• Sugar: 30g
• Sodium: 60mg
• Cholesterol: 180mg

FAQs

Source: Mastering the Art of French Cooking, Vol. 1 by Julia Child, Pages 604-605

– Claire