Hazelnut oil is an increasingly popular nut oil, usually cold or expeller pressed from roasted hazelnuts, which may be alternately called filberts. Its not the easiest oil to find, and it is fairly expensive. Most brands of hazelnut oil are exports from Turkey and parts of Asia where the hazel tree is native. A few brands of hazelnut oil are made in the US and come from Washington or Oregon. You may even find a brand or two grown and made in France. If you like hazelnuts, you may really enjoy this oil. Its taste is quite similar to the hazelnut, and many call it a fairly strong taste. You might want to consider using part hazelnut oil in a recipe and mixing it with lighter oil like canola. This can increase its stability when exposed to high heat, and can cut down a bit on the flavor of the oil.