Filo is a thin dough. It is prepared as follows: combine flour with water and olive oil in a bowl, mix thoroughly and roll out thinly. During baking, the layers of dough increase in volume and become airy. Filo dough is considered healthier because it does not contain a combination of flour and butter or milk, which is high in calories. Filo is great for sweet baked goods, such as cherry. The berries can be taken either fresh or frozen. The seeds must first be removed.