Gruyere Vasilits it is a type of hard yellow Greek cheese. Its name is corruption gruyere or gruyère, a Swiss cheese from the eponymous town of Gruyere. Both cheeses have a similar ripening process, but have a different taste and texture, because the gruyere is made exclusively from sheep's or goat's and sheep's milk, while the gruyere is made from cow's milk. There are various types of gruyere produced in Greece, where it is the second most popular cheese after feta.