Gruyère is a hard yellow cheese famed for its sweet but mildly salty nutty flavours.  The younger the cheese the creamier and nuttier the flavour, as the cheese gets older it is a far more complex and pungent cheese.  Fully aged, around 12 months, the cheese tends to become drier and fine cracks appear in the skin which leads the cheese to becoming grainier.  The cheese is originally from the town of Gruyère in Switzerland, but the French also produce similar cheeses like Comté.

Small amounts of this cheese impart a lot of flavour, add a little to a toasted cheese sandwich for an amazing flavour boost.