Pre heat the oven to 350 degrees.
In a medium-size mixing bowl, whisk 1 cup almond flour, 1/3 cup sugar, 1/2 cup corn starch, and 1/2 tsp salt together until well combined.
Add 6 TBSP of melted butter and 1 tsp lemon paste to the dry ingredients and stir with a spoon until a crust is formed.
Press the dough into the bottom and up the sides of a 9" tart pan. Use the bottom of a metal measuring cup to aid increasing a flat, uniform surface.
Chill the dough in the tart pan for 10 minutes in the freezer.
Place the tart pan on a rimmed baking sheet and bake the dough for 20 minutes, rotating the pan halfway through baking. Cool completely on a wire rack . Fill with your choice of curd, custard etc.
Do not remove the fluted ring of the tart pan until your filling has set completely.