Pro tip: I laughed at my roommate for putting mayo on grilled cheese, then I tried it at 1am
I told her it was gross for two weeks straight, but she finally made me one in our kitchen in Boise and the outside crisped up way better than butter ever gets. Now I keep a jar next to the stove and I've made about 20 of them this way. Anyone else got a swap like this that sounds wrong but actually works?