Gyros Grill is a small appliance that can be used to prepare different types of gyros. It can be found in buy mode under "Appliances ->small appliances ". It costs 350$, and it comes in only 1 color (but if you want to recolor it, go for it).
When you press on the object you'll see an option to 'Prepare Gyros', which will open a selection menu and you can choose from 10 different options:
The wraps are cheaper (6$ Veggie, 7$ Chicken, 8$ the rest), plates are more expensive (12$ Veggie, 14$ Chicken, 16$ the rest).
They have optional ingredients, if you have them you can prepare the gyros for free.