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In a medium pan, on low to medium heat, sweat the soffritto of diced celery, carrot and onion.
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Sprinkle with a pinch of salt, then cover and allow to cook till soft and slightly golden.
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Add the sage leaves and mix, then set aside 1/3 of the drained beans and add the rest to the pan.
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Stir for a minute or two to heat through and blend.
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Add the bean liquid and the rest of the beans. Bring to a boil, then quickly reduce heat to low and allow to cook for 10 minutes.
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Stir in the tomato paste and after 2 minutes, turn off the heat.
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Adjust seasonings to your taste. Serve with a swirl of olive oil and a grating of Parmesan cheese.