Purée the potatoes. Add the milk. Season. Brown the sausages very quickly in hot oil and if they are very thick, cut them in pieces.
Put half the potato on the bottom of an ovenproof dish and then half the tomatoes. Season again. Lay the sausages on this, cover with the rest of the tomatoes and finish with the rest of the potatoes. Dot with little pieces of butter and bake in a moderate oven for about 45 minutes or until browned.
Marilyn Monroedipped potato chips in champagne in the film The Seven Year Itch.
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