First, peel the potatoes and place them in a pan of boiling water on the cooker. While they are cooking, prepare the fish by carefully removing any bones left behind by the fishmonger. Chop the onion and gently fry it in the butter or margarine in a large pan. Then add the milk and fish and bring back to the boil.
When the potatoes are about almost completely cooked but not mushy, drain them, then add them to the mixture of onions, milk and fish. Add salt and pepper generously.
Continue to cook until the potatoes are soft, then adjust the seasoning and serve.
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