In a large bowl, mix together the melted butter and sugar with a spatula.
Add the flour and a pinch of salt, stirring until a soft dough forms. Avoid overmixing and don’t knead with your hands.
Break the dough into small pieces and scatter them in the tart pan. Use floured fingertips to press it evenly into the sides first, then the base. It may look like too little dough, but it will cover.
Bake the crust for 15–18 minutes, or until lightly golden.
Remove from the oven and immediately sprinkle the ground almonds (or almond flour or cookie crumbs) evenly over the warm base.