Um, how have I never thought of this before? I got the idea from here. What an easy way to give a simple grilled cheese sandwich a twist.
All you do is butter one side of two slices of bread. Put a slice of cheddar cheese, a few thin slices of granny smith apples, another slice of cheese in between the bread slices (buttered sides out). Then, fry it in small frying pan! Voila! It was great!