Natural ground hazelnuts, or hazelnut flour, are made from whole, raw hazelnuts (filberts) that have been finely ground. This nut flour retains the rich, sweet flavor of the whole nuts and has a slightly coarse texture. Natural ground hazelnuts can be used in a variety of recipes, such as cookies, cakes, and bread, to add a nutty flavor and moisture. They also work well as a gluten-free alternative in various dishes and can be used to thicken sauces or as a topping for yogurt and oatmeal.