Vegetarian recipe ideas
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Melt half the butter in a small frying pan. Slice the leek into thin discs and toss in the hot butter. Season with lots of black pepper and fry gently for about 5 minutes until the leek is soft and translucent, stirring every now and then. Any excess liquid should have gone, but the leek should still be moist.
Meanwhile, heat the grill to hot. Put the bread on a baking tray and toast on both sides. Spread with butter.
Stir the mustard and crabmeat into the softened leek and add a little grated nutmeg. Cook until the mixture is warmed through, then distribute between the slices of toast. Scatter the cheese on top. Return to the grill for a few seconds until the cheese is melted and lightly brown. Slide onto 2 plates and serve hot.