Preheat your oven to 400°F.

In a mixing bowl, combine the fresh lemon zest, lemon juice, and sugar; stir until well blended.

Lightly flour a clean surface and roll out the puff pastry to about 1/8 inch thickness.

Use a round cutter to cut circles from the pastry. Place a teaspoon of lemon filling in the center of each circle, then fold over and press edges with a fork to seal.

Brush the tops of the pastries with egg wash or a vegan alternative.

Arrange on a baking sheet lined with parchment paper and bake for 15-20 minutes, or until golden brown.

Allow to cool on a wire rack for a few minutes before serving.