Quick calzone help!

[Impulsesealer]

About to make a calzone and fancy some onion in with it. Does it need to be cooked first? Anything else that needs to be cooked before it goes in?

I'd cook everything that might be raw meat inside a calzone before folding it over - it only bakes for 15 mins or so to cook the crust and heat through and melt the cheese inside which is why usually it's just sauce, cheese, and cured/cooked meats like salami or Parma ham. So I'd cook onions and any veg first.

Ex Italian restaurant worker here - cook all raw ingredients before :)