01 - Set the oven temperature to 375°F (190°C).
02 - Combine flour and salt in a mixing bowl. Incorporate cold cubed butter by rubbing it into the dry ingredients until the mixture resembles coarse crumbs. Add cold water gradually until the dough comes together.
03 - Roll the dough to a thickness of 1/8 inch on a lightly floured surface. Cut rounds approximately 3 inches in diameter to fit mini tartlet pans. Press dough gently into pans, trim excess, and prick base with a fork.
04 - Bake tart shells for 10 minutes, then remove from the oven.
05 - Whisk eggs and sugar until smooth in a medium bowl. Stir in lemon zest, lemon juice, heavy cream, and melted butter until fully combined.
06 - Pour lemon mixture into the pre-baked tart shells. Return to oven and bake for an additional 12 to 15 minutes until filling sets with a slight wobble in the center.
07 - Allow tarts to cool to room temperature. Remove from pans and finish with lemon zest and fresh herbs if desired. Serve chilled or at room temperature.