The ear is one of their tapas or main dishes, I personally don't like it. But most people eat this dish, depending on the place they add garlic-parsley sauce, oregano, hot sauce.
They also usually eat it in sauce with onion and other spices.
And other dishes, lacón a la gallega, cayos a la madrileña (basically the stomach of the cow cooked with chickpeas), panceta, bacon, something called "cachopo" have many things.

If you are ever in Madrid let me know, I will be happy to give you a tour.