Spanakopita contains a filling of chopped spinach, feta cheese, onions or scallions, egg, and seasoning. The filling is wrapped or layered in phyllo (filo) pastry with butter and/or olive oil, either in a large pan from which individual servings are cut, or rolled into individual triangular servings. While the filo-dough recipe is most common, many recipes from the Greek islands call for a crust made of flour and water to form a crunchier, calzone-like exterior in place of the flaky filo dough. The pastry is golden in color when baked, the color often enhanced by butter and egg yolk. Other white, fresh, preferably salted cheeses may also be mixed with, or substituted for, the feta cheese. It can be served straight from the oven or at room temperature.