This is typically done outdoors, the style being rather rustic with only bread, mayonnaise and wedges of lemon to go with the crab.
en.wikipedia.org It can be made with different fillings, such as tuna, crab meat, avocado, mayonnaise, cucumber or carrots.
en.wikipedia.org The sandwich is made with pulled turkey, cranberry sauce, stuffing and mayonnaise.
en.wikipedia.org Additional flavor and nutrition was provided from inexpensive canned tomato paste and puree, hummus, tahina, and mayonnaise in tubes.
en.wikipedia.org When ingredients are themselves made of a number of sub-ingredients (i.e. a mayonnaise), these must be declared as well in the ingredient declaration.
en.wikipedia.org