berries, mint sprigs, or freshly sliced lemon or lime, for garnish
Whip the cream with the sugar until thick. Fold in the lemon juice and rind, and the extract. Pour into individual ramekins, non-stick muffin tins, or a decorative mold. Cover with plastic wrap and freeze. A large mold will take 3 hours for the parfait to harden, but individual servings take only about an hour. When ready to serve, add fruit or mint as a garnish.