Could you help with this debate, which arose during the frantic buttering of sandwiches for a children's party?
My Dsis thinks that you only butter one slice of bread in a sandwich; I think you need the buttery stickiness on both slices of bread, to make sure that the top slice adheres to the filling properly, and to make it tastier and less dry.
Can you help me prove that I'm being eminently reasonable here...?