the great one ate peanut butter and banana sandwiches. BP is such a strong flavor, and the main ingredient of such a sandwich that they are BP and banana sandwiches, not banana sandwiches.

banana sandwich's, on our house, were:
open faced,
made on whole wheat bread,
with lettuce and salt and pepper (salt you can pass on, a dust of fresh black pepper is a must.)

when indulging, they could be closed (2 slices of bread)
the bananas are slices, and slightly mashed onto the bread, topped with lettuce and seasoning.

PB sandwiches come as:
PB and Jelly (grape and strawberry the most common jelly)
PB and bacon
PB and Banana
PB and fluff (truly for the sweet tooth!) (fluff is marshmallow merique sold in jars like jelly)

and esoteric personal or family favorites, like
PB and olives
or
PB and sharp cheddar cheese(one of my personal childhood favorites)
or what ever you (or yours) chose.

PB sandwiches are made on white bread (plain or toasted) and the main ingredient is the PB--