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Published online by Cambridge University Press: 21 October 2010
Pan y cebolla — bread and onion. In Madrid or Mexico City, you may see construction workers at lunch or at a rest break having a nutritious and economical snack: an onion sandwich, made simply of a barra de pan — a hard roll — and a juicy Spanish onion, washed down perhaps with wine drunk from the bottle. It is an eminently proletarian lunch.