It was definitely tasty and for me exactly enough for what I had in mind tonight. I can picture it on a long crusty roll. That would be excellent. As I was eating I was thinking of condiments, but I can't imagine anything being better than the carmelized onions. I wouldn't change a thing! I used sharp cheddar. We have habanero cheddar but I didn't want the habanero to step on the other flavors. American would work fine or if you can get it Hoffmans sharp cheddar or Coopers. Coopers melts better than Hoffmans.