Preheat oven to 350°F. Line the base of a tart pan with parchment paper.
Whisk together ground almonds, flour, sugar, salt and almond extract.
Cut in butter with a pastry blender until it’s completely incorporated.
Firmly press half the dough into the bottom of the pan. Spread a layer of jam over the dough base.
Sprinkle a thin layer of flaked almonds over the jam.
Bake until the edges are golden brown, about 24 minutes.
Transfer to a wire rack to cool before removing from the pan.
Dust with powdered sugar and serve. Save the rest of the dough for cookies. Recipe from Martha Stewart.