Graviera is one of the most popular cheeses in Greece. It is a hard cheese wtih a light yellow color, and has a slightly sweet and nutty taste. The Cretan version (there is also a graviera made in Naxos) is made with sheep milk, or sheep milk with a small amount of goat milk.
There is also a type made with cow’s milk, salt, rennet and culture. It has a rich, sweetand buttery taste.
Gravier can be used in many dishes, in Greek pies, grated on pasta, served as a table cheese or as a delicious snack along with bread and fruits.
They compare it to Gruyere cheese, but I cannot say as I have not tried it.