Black truffles are a type of edible fungus that grow underground, typically in association with the roots of certain trees like oak and hazelnut. They are highly prized for their unique aroma and flavor, making them a sought-after ingredient in gourmet cooking. Black truffles are primarily found in regions of France, Italy, and Spain. Harvesting black truffles is a specialized process, often involving trained dogs or pigs that can detect their strong scent. They are usually harvested in the winter months and can be quite expensive due to their rarity and the difficulty of finding them.