Prepare the Dough: Begin by mixing together the flour, lemon zest, sugar, and butter in a bowl until a soft dough forms. Once mixed, wrap the dough in plastic wrap and refrigerate for 30 minutes.
Bake the Dough: Preheat your oven to 180°C (356°F). Once the dough has chilled, line small molds with the dough and bake until golden brown for about 12-15 minutes.
Make the Cream Filling: While the dough is baking, in a saucepan, combine the lemon juice, milk, sugar, and cornstarch. Stir the mixture over medium heat, continuously, until it thickens.
Assemble the Cakes: After the mini cakes have cooled, fill each tartlet with the creamy lemon mixture and let them chill.
Add the Decoration: Finally, whip the cream until it forms soft peaks. Top each Mini Lemon Cake with a beautiful rosette of whipped cream and get ready to serve!