What is 'mayu' and what does it taste like?

Mayu, or black garlic oil, is a type of aromatic oil that is made from blackened garlic. The garlic is cooked slowly in oil until it turns black and develops a deep, smoky, and slightly bitter flavor. Mayu is a popular topping for tonkotsu ramen, as its strong flavor provides a great contrast to the rich and creamy broth. A few drops of mayu can add a powerful and complex flavor to a bowl of ramen.