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English Mushroom Sauce

2 tablespoons chopped onion 1/3 cup strained stewed tomato 1 teaspoon salt 2 tablespoons butter 1/2 cup mushrooms 1 1/2 cups brown sauce Cook the onion and butter fifteen to twenty minutes in a double boiler. Add the tomato and other seasonings. Chop the mushrooms, and add; then stir in the brown sauce. Reheat, and serve.