A light, silky lemon mousse built with whipped cream and Italian meringue for a genuinely airy texture. Juice and zest keep the citrus bright, while a small amount of gelatin supports the mousse without making it rubbery. Chilled, refreshing, and clean on the finish.
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Sprinkle the unflavored gelatin over 35 ml of the cold water and let it bloom for 5 minutes. Warm it briefly in the microwave until completely liquid, without boiling. Mix in the lemon juice and zest and let it cool until fluid and only slightly warm, around 25–30°C.
Whip the well-chilled cream for 2–3 minutes, until it reaches soft peaks: it should hold a curved peak on the beaters while remaining smooth and flexible. Refrigerate it while preparing the meringue; whipping to stiff peaks will make the mousse less delicate.
Place the sugar and remaining 45 ml of water in a saucepan and cook without stirring until it reaches 118°C. When the syrup reaches about 110°C, begin beating the egg whites on medium speed until foamy. With the mixer running, pour the hot syrup in a thin stream down the side of the bowl, avoiding the beaters. Continue beating for 5–6 minutes, until the meringue is glossy, firm, and only slightly warm.
Fold the lemon base into the meringue in 3 additions, mixing gently with a spatula until even. Then fold in the whipped cream in 2 additions, sweeping from the bottom of the bowl. Stop as soon as the white streaks disappear: the finished mixture should be light, smooth, and airy, not runny or overmixed.
Immediately divide the mousse among 6 glasses and refrigerate for at least 3 hours, until completely chilled and able to hold a spoonful without losing its foamy texture. Serve straight from the refrigerator. It should feel airy first, creamy second, and distinctly citrusy on the finish. A lemon cloud—if it bounces like gelatin, the setting went a little too far.
