The term 'lettuce serving' can be broken down into two crossword solutions: BED and WEDGE. BED is a 3-letter word that refers to a piece of furniture used for sleeping, typically consisting of a mattress on a raised frame. WEDGE is a 5-letter word that refers to a shaped object, usually made of metal or wood, used to hold two objects together or to separate them. In the context of lettuce serving, these two words could refer to a BED of lettuce, which is a large serving of lettuce arranged in a mound, and a WEDGE of lettuce, which is a single slice of lettuce cut from a larger head.