Berry-lemon tartlets

Place sugar, lemon zest, and eggs in a heavy-bottomed sauce pan; set over medium heat. Whisk constantly until mixture is combined and warmed through, 3-4 minutes. Add lemon juice and butter; cook, whisking constantly, until slightly thickened and bubbly, 4-5 minutes. Cool to room temperature and then refrigerate until thoroughly chilled and thickened; once chilled, fold in whipped topping until just combined.

Preheat oven to 350°F.

Place phyllo shells on a cookie sheet; bake until crispy, about 5 minutes. Let cool and then spoon about 2 tsp lemon mixture into each shell. When ready to serve, garnish each with a berry.