For the dough:
For the filling:
Make the dough: Mix all the ingredients with 2/3 cup plus 2 Tbsp of cold water in an electric mixer with a paddle until a ball forms, adding flour or water as needed. Cut in half, shape into balls, and wrap. Refrigerate at least 1/2 hour.
Make the filling: Preheat the over to 400°. Place the squash cut side down on a baking sheet. Brush with 1 Tbsp of olive oil; bake 1/2 hour, or until soft. Scoop out pulp. Spoon into cheesecloth; squeeze dry; add to the nutmeg in a bowl. Cook the garlic in 1/4 cup of olive oil; add the spinach and salt; cook 5 minutes. Pile into cheesecloth, and squeeze dry; pile in a bowl. In a third bowl, mix the ricotta, Parmigiano, salt and pepper.
Assemble the torta: Roll out 1 ball of dough on a floured counter until it is 12 inches in diameter and 1/4 inch thick. Brush a 9-inch pie pan with the remaining olive oil; line the bottom and sides with the dough. Spoon in the squash, then the ricotta, and finally the spinach, making sure that the layers do not mingle. Brush the edges with the egg. Roll out the remaining dough 1/5-inch thick; place on top of the filling. Seal; trim excess and brush with egg. Bake 40 minutes, or until golden brown. Serve hot or warm. Serves 8.
Pair with Ferrari-Carano Chardonnay.