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For the filling:

Unsalted butter, for the baking dish

2 pounds peaches or nectarines, peeled, pitted and thinly sliced

1 pound plums, peeled, pitted and thinly sliced

2/3 cup packed light brown sugar

1 tablespoon honey

1 teaspoon grated peeled ginger

Pinch of kosher salt

1/4 cup all-purpose flour

For the biscuits:

1 2/3 cups all-purpose flour, plus more for dusting

1/4 cup granulated sugar

1 1/2 tablespoons baking powder

1/8 teaspoon kosher salt

6 tablespoons cold unsalted butter, cut into small pieces

2/3 cup buttermilk, plus more for brushing

Coarse sugar, for sprinkling