- Heat oven to 425 degrees. Blind bake tart shell until lightly browned, about 15 minutes. (You do not need to cover the shell or use pie weights.)
- Meanwhile, make the filling: Put almonds, flour and sugar in work bowl of food processor and grind to a rough powder. Add butter and pulse until well incorporated. Add eggs and almond extract and process until smooth and creamy, about 2 minutes. (Alternatively, use ground almonds and make batter with a mixer instead.)
- Pour almond batter into prebaked shell and smooth with a spatula. Press cherries into batter in a single layer. Sprinkle with a handful of sliced almonds. Lower oven temperature to 375 degrees and bake until golden, 30 to 40 minutes. (An inserted skewer should come out clean.) Cool on a rack and remove outer rim of tart pan. Place tart on a serving dish and dust with confectioners’ sugar.