There are two different ways to make lamb gyros. Gyro's are traditionally made of ground meat that is packed onto a skewer and cooked on a rotation. You can make this at home by seasoning and letting ground lamb set in a pan in the fridge. After that you can slice it in pieces and cook it on a pan so it gives it a gyro effect. I prefer buying a fresh leg of lamb and cooking it in the oven so its crispy on the outside and soft on the inside. After that, just throw it in the pita with all of the toppings that you prefer.