For the crust:
2 sticks butter (½ pound) at room temperature
½ cup granulated sugar
1½ cups all purpose flour
½ cup finely chopped pistachios
⅛ teaspoon salt
For the filling:
5 eggs at room temperature
1¾ cups granulated sugar
zest of 6 clementines
½ cup fresh clementine juice (about 6 medium)
¼ cup lemon fresh lemon juice
½ cup all purpose flour
1 teaspoon baking powder
For the topping:
scraps from crust
¼ cup flour
¼ cup finely chopped pistachios
2 tablespoons butter
1 teaspoon sugar
confectioners’ sugar for dusting