Leeks are from the same family as onions and garlic (allium), but have a much sweeter, milder flavour. According to legend, seventh-century Welsh soldiers wore leeks in their hats to distinguish them from the enemy army. Ever since, the allium has been one of Wales' national symbols. Choose leeks with bright green tops. Trim the root and leaf tops before rinsing well to remove grit and soil. For a sophisticated twist on cheese on toast, soften half a sliced leek in butter. Stir in crumbled blue cheese, then spoon onto a slice of crusty bread and grill until golden.
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