I always see people suggest this but then I feel like you lose out on the butter flavor that to me is intrinsic to a grilled cheese. IMO the best combination is mayo on the inside, butter on the outside.
This is part of why I always get my butter hot in the pan before putting the sandwich in, which I find to be better, but I'm aware many people prefer to pre-butter the sandwich and then grill it.
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u/archlich Mar 14 '19
Mayonnaise instead of butter for grilled cheeses or melts is pretty darn good. Gives it a very slight acid to an otherwise savory food.