Boutargue is a food product that is produced from mule or red tuna eggs. It is mainly produced in the Mediterranean, and is particularly popular in French, Italian and Spanish kitchens. The Boutargue is made by drying and salting the fish eggs, then pressing them to extract the oil. The end result is a dense and dark paste, which has a strong and salty taste, and which is often used as a condiment or to flavor the dishes.