Mascarpone, Rum and Lime Cream

• 3 eggs, separated
• 6 tablespoons (90 g) caster sugar

Whisk the egg yolks and sugar together till light and moussily creamy. In another bowl, stir the mascarpone together with the rum and juice of 1 lime. Stir the egg mixture in gently but firmly, with a folding movement, and taste; you may want to add a little more lime juice. Don’t worry about sharpness unduly: you need that to hold the egg-enriched mascarpone in check; what you want to end up w