The key to this is the quality of the ingredients.

This is an often made open face sandwich lunch.

From the bottom to the top:

Jewish Rye, lightly toasted
Thinly sliced sweet onion
Thinly sliced tomato
Wild Planet, wild caught sardines in EVOO, lightly smoked. One can will cover the bread.
Topped with Central Grocery Olive Salad

Enjoy