Make the crust: Whisk the all-purpose flour, whole-wheat flour, granulated sugar, cinnamon and salt in a large bowl. Work in the butter until it is in pea-size pieces. Mix the sour cream with 3 tablespoons ice water, then stir into the flour mixture with a fork. Turn out the dough onto a piece of plastic wrap, press into a disk and wrap. Refrigerate 2 hours. Roll out the dough on a floured surface into a 12-inch circle. Place on a baking sheet and refrigerate 30 minutes.
Preheat the oven to 400˚ F. Make the filling: Toss the peaches and plums with the granulated sugar, cornstarch and lemon juice. Arrange the fruit over the dough, leaving a 1 1/2-inch border. Fold in the edge of the dough, pleating as needed.
Bake the galette: Brush the edge of the dough with beaten egg and sprinkle with coarse sugar. Bake until golden and bubbling, 45 to 50 minutes.
Tools You May Need
Photograph by Andrew Purcell
Tools You May Need
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