Medieval Spinach Pie

Name: Medieval Spinach Pie
Ingredients: 18 ounces, about 3 cups, all-purpose flour; 10-12 ounces frozen spinach or 1 pound fresh baby spinach; 8 ounces blanched almonds; 4 large eggs, separated; 1/4 teaspoon salt; 2 teaspoons baking powder; 9 ounces butter, 2 sticks plus 2 tablespoons, unsalted butter; 7/8 cup granulated sugar; 4 large egg yolks; Zest of 1 lemon; 2/3 cup granulated sugar; 2 1/2 ounces minced candied lemon peel; 1/4 cup Marschino or other fruit liqueur; 2 tablespoons pine nuts; Confectioners’ sugar