A forgotten bag of watercress makes a great addition to soup. Try adding a handful to Asian-style broths – once the leaves have wilted down, you won’t notice that they’re past their best – or make classic watercress and potato soup. This lovely leaf is also great for adding a bit of punchy flavour to homemade mayonnaise, pesto or even mashed potatoes.

Now discover these tasty no-recipe recipes

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Easy ways to turn leftovers into delicious new meals