Tartine di Mortadella e Cetriolini

Two aspects of our life in Venice led to this recipe: There are eighty-two steps from ground level to our floor (our sixteenth-century house has no elevator), and the telephone is always ringing, announcing visitors. One day the call came late in the afternoon, and the only time we were free to see the callers was immediately. I had nothing in the house to serve with drinks and, having been out several times that morning, I felt running down to the shops—and back up—was out of the question.