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Cook the broad beans in a pan of boiling salted water for 3 mins until they float. Drain and quickly run under ice-cold water to stop them cooking. Squeeze the small green beans from their skins and discard the skins.
Fry the garlic and anchovies in a small pan for a few mins until golden, then stir through the broad beans. Transfer to a bowl (or use a pestle and mortar) and crush the broad beans with the Parmesan, lemon juice and zest, and oil. Will keep in the fridge for 3 days.