Cremini Mushroom, Goat Cheese, and Leek Crostata with Fresh Thyme

 

For the pastry (makes 2 crusts):

2 cups all-purpose flour

1/2 tsp. kosher salt

1/2 pound (2 sticks) cold butter, diced

6 T. ice water

1 egg

 

For the filling

1 T. butter

1 small leek, chopped

8 ounces quartered cremini mushrooms

Kosher salt

2 tsp. fresh thyme

4 ounces goat cheese

 

Place the flour and 1/2 tsp. kosher salt in the food processor. Pulse a few times to combine. Add the butter and pulse 12 to 15 times, or until the butter is the size of peas. With the motor running, add the ice water all at once through the feed tube. Keep hitting the pulse button to combine, but stop the machine just before the dough comes together. Turn the dough out onto a well-floured board, roll it into a ball, cut in half, and form into 2 flat disks. Wrap the disks in plastic and refrigerate one for at least 1 hour. The other disk of dough can be frozen for a future use. Heat the butter in a skillet over medium heat. Sauté the mushrooms for a few minutes until they’re slightly softened. Add the leeks and a pinch of salt and continue to cook for several more minutes. Stir in thyme. Preheat the oven to 450 degrees. Line a baking sheet with parchment paper. Roll the pastry into an 11-inch circle on a lightly floured surface. Transfer it to the baking sheet. Cut the goat cheese into small pieces onto the center of the crust, and top with the vegetables. Fold in the edges of the crust, and brush with a beaten egg. Bake for 20 minutes until golden brown.