Preheat Oven and Prepare Pan: Preheat oven to 350°F (175°C). Grease or line a mini muffin pan.
Crust: Mix flour, butter, and salt until crumbly. Press into muffin cups. Bake 8-10 mins, until golden.
Lemon Curd: Whisk lemon juice, zest, sugar, and eggs in a saucepan over medium heat. Stir until thickened, then let cool.
Fill Crusts: Spoon lemon curd into each crust.
Meringue Topping: Beat egg whites to soft peaks, add sugar gradually, and beat to stiff peaks. Spoon or pipe onto lemon curd.
Final Bake: Bake for 5-7 minutes until meringue is golden. Cool before serving.