1single pie crustuse 1/2 this recipe & freeze rest for a later use
1egg beaten with a splash of milk
Coarse sugaroptional (like Sugar in the Raw)
Preheat the oven to 425ºF220ºC. Line a rimmed baking sheet with a piece of parchment long enough to hang over the sides of the pan.
Add the rhubarbstrawberries, sugar, lemon juice, flour, and salt in a medium bowl. Stir until well combined. Set aside, and the fruits release some of their juices while you roll out the pie crust.
Divide the crust into 4 equal sized balls. Shape them into a circle. Roll one ball out into a circlea little less than 1/4-inch thick.
Spoon 1/4 of the fruit filling onto one half of the circleleaving a 1/2-inch border. Fold the unfilled side of the dough over the fruit, and pinch the edges closed to seal tightly. You should now have a half moon shaped pie. For a decorative finish, crimp the edges with the back of a fork, or flute them. Repeat with the remaining dough and filling.
Use a spatula to transfer the pies to the prepared pan. Brush the tops with the egg washand sprinkle with a bit of coarse sugar, if desired. Use the tip of a fork to poke holes in the top, about 1-inch apart so the pies don't burst open while baking.
Bake for 15 minutesthen reduce to temperature to 350ºF, and bake for 15 minutes more, until golden. Juices will bubble from the pies, that's a sign they're done, too. Let cool at least 15 minutes before serving.