- Place the flour, cornmeal, salt and sugar in the bowl of a food processor and pulse to combine. Add the butter and pulse a few times until the butter has started to incorporate but small pieces of butter remain. Adding ice water 2 tablespoons at a time, pulse until the mixture resembles wet sand. Pour onto a work surface and shape into a disc (knead a bit of the dough if is a little too crumbly to shape together.) Cut the disc in half and shape each half into a disc. Wrap with plastic wrap and place in the refrigerator to chill, at least 1 hour or overnight.
- Place a baking sheet in the oven and preheat to 400º. On a lightly floured surface, roll out one of the discs of dough until it is about 11” in diameter. Line a 9” tart or pie plate and prick the bottom of the dough with a fork. Place in the refrigerator to chill.
- Meanwhile, make your filling. Combine all of the ingredients and gently toss to combine.
- Roll out the remaining dough until it is about 1/8” thick. Cut into 1 1/2” wide strands. Pour the blueberry mixture into the pie plate and braid the strands decoratively on top. Tuck in edges and pinch together to make a crust. Brush with cream and sprinkle generously with sugar.
- Place on the baking sheet and bake for 10 minutes, then reduce the heat to 350º. Bake for another 30-35 minutes, or until the berries have begun to burst and the crust is nicely golden-brown.
- Let cool at least 20 minutes before serving.