Grilled cheese and tomato soup.  Grilled cheese made on my well-seasoned cast iron skillet - cheese in between bread, pre-heat on burner and put a little butter down for good measure.  Result - perfectly done grilled cheese sandwich in 5 minutes.  How to clean up?  Let cast iron cool, wipe with paper towel.  (No, seriously, that’s all you have to do).  Another layer of seasoning!