That's a cool idea, but not very practical. So you're making a sandwich and, like regular fried cheese, you have to butter the outer slices of a very THIN bread. Well, then you need to figure out how to fit this butter sandwich into a small mesh bag without spilling it all over your hands (you can't). You have to turn your toaster on very high, which means you have to wait a few minutes to get an unevenly "toasted" sandwich. Then you have to take it out of your pocket. In the time it took to do this, you could simply make a sandwich, heat a frying pan, and toast it as usual. Don't get your hands on everything. It's your decision.
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