Yields: 2 galettes
Prepare the dough. In the food processor combine flour, sugar, salt, and butter. Pulse until mixture resembles coarse meal. Add water and pulse to get a crumbly dough. Transfer the dough into two plastic wraps and form into ¾ inch thick disks. Wrap and refrigerate for about 30 minutes.
Prepare the filling. Sprinkle cherries with the lemon zest and ¼ cup of sugar. Mix to incorporate. In a separate bowl mix corn starch and 2 tbs sugar.
Preheat the oven to 400⁰F /200⁰C.
Assemble the galettes. Roll each disk to a circle, 12 inches/ 30 cm in diameter. Sprinkle the middle with the starch and sugar mixture, leaving about 2 inches/ 5 cm from the edges. Brush that space around the edges with buttermilk. Place the filling on the sprinkled area and fold the dough around it. You can fold it any way you want - from clumsy to neat – it will look gorgeous in the end any way. Pinch the folded edges, so that the filling doesn’t leak out while baking.
Brush the dough of the galettes with remaining buttermilk and sprinkle with brown sugar and cinnamon.
Bake for 30-35 minutes at 400⁰F /200⁰C until golden brown. Let cool for about 20 minutes. Sprinkle with powdered sugar if desired.