Gruyère is sweet but slightly salty, with a flavor that varies widely with age. It is often described as creamy and nutty when young, becoming with age more assertive, earthy, and complex. When fully aged (five months to a year) it tends to have small holes and cracks which impart a slightly grainy mouthfeel. To make an 176 lb round of Gruyère cheese, about 2110 gallons of milk are used.