A member of the cabbage family, kale has a peppery flavour and is rich in nutrients. You can get hold of it all year round, but it's at its tastiest between September and February. Kale will wilt in warm temperatures, so store it in the fridge to keep it fresh. It freezes well, too. There are several varieties of kale, including smooth, curly and black – also known as cavolo nero. Try whizzing in a food processor with pine nuts, Parmesan, garlic and olive oil for a twist on traditional pesto.
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