Equipment
Ingredients
Fruit Base
- 250 g rhubarb, chopped into 1cm pieces
- 250 g strawberries, hulled and quartered
- 100 g caster sugar
- 15 ml lemon juice, freshly squeezed
Gelatin
- 30 ml water, cold
- 7 g unflavored gelatin powder
Aeration
- 200 ml heavy cream, chilled
- 60 g pasteurized egg whites, room temperature
- 50 g caster sugar
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 363 kcal
- Protein
- 6 g
- Carbohydrates
- 47 g
- Fat
- 18 g
- Fiber
- 2 g
- Sugar
- 43 g
- Sodium
- 46 mg
- Saturated Fat
- 12 g
- Trans Fat
- 1 g
- Monounsaturated Fat
- 5 g
- Polyunsaturated Fat
- 1 g
- Cholesterol
- 57 mg
- Potassium
- 353 mg
- Calcium
- 100 mg
- Iron
- 0.5 mg
- Magnesium
- 21 mg
- Phosphorus
- 56 mg
- Zinc
- 0.3 mg
- Vitamin A
- 209 mcg
- Vitamin C
- 44 mg
- Vitamin D
- 0.8 mcg
- Vitamin E
- 0.8 mg
- Vitamin K
- 21 mcg
- Vitamin B6
- 0.1 mg
- Vitamin B12
- 0.1 mcg
- Thiamin
- 0.04 mg
- Riboflavin
- 0.21 mg
- Niacin
- 0.5 mg
- Folate
- 23 mcg
- Water
- 169 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
In a small bowl, sprinkle the gelatin powder over the cold water. Stir briefly and let it sit for 5 minutes to bloom.
Combine the rhubarb, strawberries, 100g caster sugar, and lemon juice in a saucepan over medium heat. Simmer until the fruit breaks down completely, about 10 to 15 minutes. The mixture should reach approximately 90°C/194°F.
Transfer the hot fruit mixture to a blender and process until completely smooth.
Pass the pureed fruit through a fine mesh sieve into a clean bowl to remove seeds and any fibrous rhubarb strings.
While the strained puree is still hot, add the bloomed gelatin. Stir thoroughly until the gelatin is completely dissolved.
Allow the fruit base to cool to room temperature, stirring occasionally to prevent a skin from forming. It should feel cool to the touch but not yet set.
In a separate mixing bowl, whip the chilled heavy cream until it reaches soft peaks. Do not over-whip, as it will continue to thicken when folded.
In another impeccably clean bowl, whip the pasteurized egg whites until foamy. Gradually sprinkle in the remaining 50g of caster sugar and continue whipping until you achieve stiff, glossy peaks.
Gently fold the whipped cream into the cooled fruit base until just combined, ensuring no white streaks remain.
Carefully fold the whipped egg whites into the mixture in three separate additions. Use a gentle, scooping motion to retain as much air as possible.
Divide the mousse evenly among 4 serving glasses or bowls. Cover lightly and refrigerate for at least 4 hours until completely set.
Chef's Notes
- Always use pasteurized egg whites when making preparations that will not be cooked further. This ensures food safety, particularly for vulnerable populations.
- Rhubarb varies wildly in color from pale green to deep crimson. For a vibrantly pink mousse without food coloring, choose the reddest stalks available.
- When folding aeration into your base, temperature control is crucial. If the fruit puree is too warm, it will melt the whipped cream; if it is too cold, the gelatin will set prematurely and create lumps.
Storage
Refrigerator: 3 days — Keep tightly covered to prevent absorption of refrigerator odors.
Troubleshooting
Mousse has a grainy or rubbery texture with small lumps
Cause: Gelatin was not fully dissolved, or the fruit puree was too cold when the gelatin was added.
Fix: Cannot be fixed once assembled.
Prevention: Ensure the fruit puree is hot enough to melt the gelatin completely. If using leaf gelatin, squeeze out excess water before adding.
Mousse is flat, dense, and lacks volume
Cause: Egg whites or cream were under-whipped, or air was knocked out during an overly aggressive folding process.
Fix: Cannot be fixed.
Prevention: Whip whites to stiff, glossy peaks and use a gentle folding motion with a flexible spatula, cutting down the center and sweeping up the sides.
Cultural Context
Mousse, translating to 'foam' in French, is a classic culinary technique that relies on air bubbles suspended in a base for its characteristic light texture. This variation applies traditional French methodology to the quintessential British and American spring flavor pairing of rhubarb and strawberry, creating an elegant dessert that celebrates seasonal produce.
