Combine sugar, cornmeal, flour, and eggs in large bowl using a whisk. Stir in melted butter, lemon juice, and lemon zest. Mix well (the filling will be very runny and that's fine). Pour into the pie crust and bake on the center oven rack for 25-35 minutes, or until filling is mostly set and golden brown. Tip - If the crust is starting to brown too quickly -- see recipe note #3. When the pie is done, remove it from the oven.
1-½ cups sugar, 1 Tablespoon cornmeal, 1 Tablespoon all purpose flour, 3 large eggs, 3 Tablespoons melted butter, ½ cup lemon juice, zest of one lemon (optional)