I tried a grilled cheese with chopped peppers from In n' Out. I liked it--it packs quite a bit of heat. It's not new but its one of their off menu items that most people don't actually try. The guy said I was the only person to order it, besides their management, his 6 years working there. I am guessing at other places it might be more common, I found out they would add them from Davis wiki afficionados. I knew they had them, I just thought you could only order them on the side. Try it . . .