Small Abruzzese pastry filled with chocolate, almond, and grape jam is a regional treasure. This rich mediterranean sweet is a family tradition in central Italy.
Preheat oven to 350°F and lightly grease eight muffin tins or small tart pans for even baking.
Cut cold butter into flour. Mix in baking powder, salt, lemon zest, and half the sugar. Work with fingertips until crumbly.
Add eggs and vanilla; knead gently until the dough just comes together. Divide, wrap in plastic, and chill for 30 minutes.
Melt dark chocolate over low heat. Combine with ground almonds, remaining sugar, and grape jam to make a uniform, thick filling.
Roll dough 1/8-inch thick. Line tins with dough, fill with 2 tbsp filling, then cover with dough discs. Press edges and prick tops gently.
Bake for 22–25 minutes on the center rack until golden. Cool 20 minutes before dusting with powdered sugar and unmolding.