Key Lime Mousse - cooking recipe

Ingredients

1/2 tablespoon grated key lime zest
1/2 cup fresh key lime juice
1/2 cup sugar
1 pinch salt
3 large eggs
3/8 cup unsalted butter, cut into bits
2/3 cup chilled heavy cream

Preparation

Whisk together zest, juice, sugar, salt, and eggs in a small heavy saucepan. Add butter and cook over medium-low heat, whisking frequently, until thick enough to hold marks of whisk, about 5 minutes.
Force mixture through a fine sieve into a bowl, then quick-chill in an ice bath, stirring occasionally, about 5 minutes.
Beat cream until it holds stiff peaks, then fold into custard gently but thoroughly. Spoon into glasses and chill at least 2 hours and up to 12.