01 - In a large mixing bowl, combine mascarpone cheese, lemon zest, lemon juice, sugar, and vanilla extract. Beat with hand mixer on medium speed until smooth and fully incorporated.
02 - In a separate chilled bowl, whip heavy cream using hand mixer until stiff peaks form. Do not overwhip.
03 - Gently fold whipped cream into mascarpone mixture in two additions using rubber spatula. Fold until just incorporated and mixture is light and airy.
04 - Spoon or pipe mousse evenly into individual serving glasses or bowls. Smooth tops with spatula if desired.
05 - Cover with plastic wrap and refrigerate for minimum 2 hours until fully set and thoroughly chilled.
06 - Top with fresh berries, sprinkle of lemon zest, and mint leaves immediately before serving.