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ONIONS (au Gratin)

Slice some Spanish onions into a fireproof baking-dish, well-greased; add a layer of crumbs and a little pepper and salt, then another layer of onions, and so on until the dish is full. Place some dabs of butter on top, and cook in the oven for about an hour and a half, or until the onions are quite soft and brown. Grate some cheese over, return to the oven for a few minutes, and serve.