I've never tried them that way. These are my thoughts though, but since I haven't tried it I could be wrong.
Doing them over low heat like that, the foil would be good for heating them throughout, but not for grilling up the bread...in fact the bread may get soggy.
If the bread has a little oil or butter on it and it is put over high heat then it may grill the bread up nice, but could tend to burn.
You might need to experiment. I think I might start with the bread buttered and start over high heat and move to low heat to finish heating up and prevent much burning.
What were they like? That might help.
Welp, never mind. Landarc to the rescue!
