'Far' comes from the Latin word for spelt, and the oldest Breton fars were savoury flour puddings, often cooked in a cloth bag in the stew pot, long before the sweet prune version.
Far Breton is a dense, flan-like cake of eggs, milk, sugar, and flour studded with prunes, baked in wide trays and cut into thick squares. Bakery stalls at Breton markets sell it by the slice, wrapped in paper for eating on the move.