Recipe: Whirl ¼ cup almond paste, 2 tbsp. packed light brown sugar, and ¼ cup sour cream in a food processor. Roll pie pastry for a single crust into a 13-in. round and lay on a baking sheet. Evenly spread almond mixture on dough, leaving a 2-in. border. Arrange sliced red-skinned plums on top and fold dough edge over plums. Brush edge with milk and sprinkle brown sugar on top of galette. Bake at 375° until crust is golden, about 35 minutes.