method
1. Lay the herrings flat on a board and sprinkle the flesh with the lemon juice and salt and black pepper to taste.
2. Put under a preheated hot grill and cook until tender, about 8 minutes each side.
3. Meanwhile, make the sauce. Melt the butter in a pan, stir in the flour and cook for 2 minutes, stirring constantly.
4. Remove the pan from the heat and gradually add the hot milk, stirring vigorously.
5. When all the milk has been incorporated, add the mustard, sugar and salt and pepper to taste.
6. Return the pan to the heat and bring slowly to the boil, stirring constantly. Lower the heat and simmer gently for 1 to 2 minutes or until the sauce thickens.
7. Transfer the grilled herrings to a hot serving platter, coat with the mustard sauce and serve immediately.
serving amount
serves 4
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