INGREDIENTS
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2 tbsp olive oil, plus a little extra (according to taste)
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3 garlic cloves, finely chopped
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2 onions, finely chopped
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2 tbsp tomato puree or tomato paste
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sea salt and freshly ground black pepper
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2 x 14 oz (400 g) cans cannellini beans
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1 tbsp finely chopped rosemary leaves
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4 cups hot chicken stock
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a few sage leaves, finely chopped
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2 lb (2.5 kg) potatoes, cut into ½ in (1 cm) cubes
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4 celery ribs, finely chopped