"Cook's Note The sauce will keep in the refrigerator for up to 24 hours. Before using, stir in a little olive oil to bring it back to life.VariationAdd a few chopped anchovies, some torn mozzarella, or a handful of wild rocket leaves to the sauce...."
INGREDIENTS
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1 red onion, finely diced
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400g can flageolet beans, drained and rinsed
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1 handful fresh flat-leaf parsley, roughly chopped
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1 garlic clove, grated or finely chopped
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2 tbsp good-quality balsamic vinegar
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1 lemon, zested, and juice of half
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350g orecchiette or other small pasta shells
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1 pinch salt
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1 pinch freshly ground black pepper