how to toast a sub a home?

So we went to jimmy johns for the first time, i got a sub thinking it was like subway.. well its not! Theres no choice in bread, which sucks. But anyways, they dont toast their subs. I got a tuna tub and its not toasted so i dont want to eat it. 
How would i toast it at home? The microwave will make the bread soggy and im not sure what temp for the oven or how long.