Fruit fillings are mixtures made primarily from fruits, often used in desserts like pies, tarts, and pastries. They can be prepared using fresh, frozen, or canned fruits, and are typically sweetened with sugar. Common fruits used for fillings include apples, berries, and peaches, which can be combined with spices or flavorings to enhance their taste. These fillings can be cooked or uncooked, depending on the recipe. Cooked fruit fillings are often thickened with ingredients like cornstarch or flour to achieve a desirable consistency. Uncooked fillings may be used in no-bake desserts, providing a fresh and vibrant flavor.