Dessert · Any · Intermediate
Dark Chocolate Mousse
two ingredients, one cloud
Dark chocolate folded through stiff-whipped whites into an airy cloud, set by cocoa butter alone — it holds a soft shape on the spoon, then melts on the tongue.
Per serving ≈ 230 cal · 5g protein · 16g fat · 20g carbs
Mousse au chocolat stripped to its two essentials — good chocolate and whipped egg whites, nothing to hide behind. It started life as a tartelette filling and outgrew the shell; here it stands on its own in a glass, the way a Paris bistro sends it out. The whole dish is only as good as the bar you buy, so buy one you'd happily eat plain.
Cooking around dairy, gluten, wine, meat…? tap to adjust
The Tools
- Cutting board + chef's knife (chopping chocolate)
- Small saucepan (double-boiler base)
- Heatproof bowl (melting, sits above the pan)
- Dry rubber spatula
- Stand or hand mixer + whisk
- Mixing bowl (whites — spotlessly grease-free)
- 4 small glasses, coupes, or ramekins
- Instant-read thermometer (optional)
✚ ends up in the sink · essentials unless marked optional
Dark Chocolate Mousse
Why this works Mousse au chocolat at its most stripped down: chocolate and whipped egg whites, nothing else. The whites hold millions of air bubbles; the chocolate coats them; as the mousse chills, cocoa butter crystallizes and locks the foam in place — the set is fat crystallization, not gelatin. Temperature decides everything at the fold: 104–113°F (40–45°C) chocolate flows around the bubbles without thinning the foam. Hotter and the foam thins and collapses; cooler and the cocoa butter firms into hard flecks the moment it hits the cool whites, breaking the fold. At 55–60% cacao the chocolate reads sweet with no bitterness, and there's enough cocoa butter (150g chocolate to 90g whites) to set the foam firm. FOOD SAFETY: the whites stay uncooked — use pasteurized-in-shell eggs for anyone pregnant or immunocompromised, and eat within 2 days.
- 150g (about 5.3 oz) Semi-sweet chocolate, 55–60% cacao 150 g — A bar you'd eat plain — you taste exactly what you buy
- 90g (about 3 large), room temperature Egg whites 90 g — Zero yolk contamination — fat kills the whip
- 15g (1 tbsp) Granulated sugar 15 g — Stabilizes the whites
- tiny pinch Kosher salt — Sharpens the chocolate
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Chop 4 min hands-on
Chop the chocolate to chip-size or smaller with a dry knife on a dry board.
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Melt over a double boiler 4 min hands-on · 3 min wait
An inch of water at a gentle simmer, heatproof bowl on top not touching the water. Chocolate and salt in; stir occasionally with a dry spatula, 3–5 minutes.
Look for Smooth, glossy, fully liquid.
Take care One drop of water seizes the chocolate into a grainy clump — unrescuable, start over. Dry bowl, dry spatula, bowl rim above the pan. -
Cool to 104–113°F 1 min hands-on · 7 min wait
Off the heat, stir occasionally for 5–8 minutes to 104–113°F (40–45°C). No thermometer: the bowl's side should feel like a warm cup of tea, not hot coffee. Start whipping the whites now so both land together.
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Whip to stiff peaks 5 min hands-on
Whites on medium speed. Once frothy and white, stream in the sugar. Whip to stiff peaks.
Look for Peaks stand straight and barely move; the surface is glossy like shaving cream.
Take care Dry, grainy, or curdled-looking means overwhipped — start over with fresh whites. Any trace of yolk or grease and they never get there. -
Sacrifice fold 1 min hands-on
Stir — not fold — one-third of the whites vigorously into the warm chocolate. Deflating this portion is the point: it lightens the chocolate so the rest can be folded gently.
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Fold in two additions 5 min hands-on
Add half the remaining whites: cut down the center with the spatula edge, scrape the bottom, fold up and over, rotate the bowl 90°, repeat until mostly combined. Add the rest and fold to uniform. Stop the moment the last white streak disappears.
Look for Uniform dark chocolate color, airy and visibly voluminous; a spoonful holds a soft shape before slowly settling.
Take care Every fold past uniform deflates air you never get back. Runny means underwhipped whites or hot chocolate; dense means overfolded or cold chocolate. -
Fill the glasses 5 min hands-on
Working while the mousse is still soft, pipe or spoon into 4 small glasses, coupes, or ramekins. Smooth the tops or leave them peaked.
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Chill to set 1 min hands-on · 2 h wait
Refrigerate at least 2 hours, ideally overnight, loosely covered — wrap not touching the surface.
Look for Set mousse holds a soft shape on the spoon, then melts on the tongue.
When it goes wrong
| Problem | Cause | Fix |
|---|---|---|
| Dense and heavy | Overfolded, or chocolate below 95°F at the fold | Fold to uniform and no further; hold the 104–113°F window |
| Runny, never set | Underwhipped whites or chocolate too hot | True stiff peaks before folding; chocolate at warm-tea temperature |
| Grainy with hard flecks | Chocolate too cool at the fold, or seized from water | Rewarm within the window before folding; keep every tool bone dry |
To the Table
Serve cold, straight from the fridge, in the glass it set in.
A drift of flaky salt or a few cocoa nibs on top for contrast — optional.
A spoonful of cherry-port coulis dragged across the surface turns it into a plated dessert (see the Sauce Cellar).
A short pour of cold cream or a rosé bubbly alongside, if you like.
For the Cook Who Wants More
The Honest Ledger
| Serves | 4 |
|---|---|
| Shopping | 20 min |
| Hands-on (new to this) | 42 min |
| Hands-on (comfortable) | 33 min |
| Hands-on (experienced) | 26 min |
| Waiting (same for everyone) | 2 h 10 min |
| True total | 2 h 56 min |
| You will dirty | 7 dishes |
A small, rich portion by design — 150g of chocolate stretched across four glasses. Naturally gluten-free. Goes fully vegan with a dairy-free bar and aquafaba (see swaps).
Words We Used
- Sacrifice fold
- Stirring a first portion of whipped whites hard into a heavier base to loosen it, so the remaining whites fold in without deflating.
- Stiff peaks
- Whipped whites that stand straight up off the whisk and barely move — the maximum stable air before they overwhip and break.
- Aquafaba
- The starchy brine from canned chickpeas; it whips like egg white and sets a genuine vegan mousse.