01 - Preheat the oven to 375°F.
02 - In a bowl, combine flour and salt. Add cold cubed butter and rub together until the mixture resembles coarse crumbs. Stir in cold water until a dough forms.
03 - Roll out dough on a lightly floured surface to 1/8-inch thickness. Cut into 3-inch rounds to fit mini tartlet pans. Gently press dough into pans and trim excess. Prick bottoms with a fork.
04 - Bake shells for 10 minutes, then remove from the oven.
05 - Whisk eggs and sugar until smooth. Add lemon zest, lemon juice, heavy cream, and melted butter, mixing until fully combined.
06 - Pour lemon filling into pre-baked tart shells. Bake an additional 12 to 15 minutes, or until just set and slightly wobbly in the center.
07 - Let tarts cool to room temperature. Remove from pans and garnish with lemon zest and fresh herbs if desired. Serve chilled or at room temperature.