I am a student that recently moved to a student apartment, I have been making grilled sandwiches and storing them in aluminium foil to eat at uni. However, this causes the sandwiches to steam themselves inside the aluminium foil and the bread becomes mushy. How can I prevent this? Is there any way to store it and be able to carry it in the backpack without it steaming itself?
No, you can't make a grilled sandwich, seal it and expect it to still be crispy later. You can reduce the mushiness quite a bit by letting the sandwich cool completely on a wire rack before you package it up. If you don't have a wire rack you can make a lattice out of chopsticks or skewers, the important thing is that the bottom of the sandwich can air cool.