Frozen filo dough, available at most supermarkets and all gourmet grocers, are the starting point for many sweet and savory pastries, such as this one. You will need to brush each sheet with butter as you go, stacking them to create an incredibly flaky base (and top) for a filling of sauteed vergetables. Don't worry if you can't fully enclose the filling before baking, as it will still be delicious.