I couldn't find a big enough cake pan, so I used a cast-iron frying pan. If possible, grate your own romano cheese. Some of the romano sold pre-grated in cardboard cylinders looks and tastes more like sawdust than cheese. The mint you want to use is spearmint. Peppermint is entirely the wrong flavor.
Italian sausage is a 'fresh' sausage, i.e. uncured and uncooked.
It must be cooked before eating. If you can't find Italian sausage, you might try a mixture of ground pork with the above seasonings, rolled into little patties. To adjust seasonings, just pan-fry a little bit of the mixture and taste. This same recipe can be used to make calzone. This is a good way to use up any filling that doesn't fit into the pie.