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1
Drain the soaked cannellini. Place them in a terracotta pot or heavy saucepan with the whole garlic cloves, the sage leaves, and 30 ml olive oil. Cover generously with cold water. Bring slowly to a gentle simmer and cook until the beans are tender throughout but still hold their shape — they will absorb the oil and garlic as they cook. This pre-seasoning from within is the foundation of the dish. The beans are ready when a single bean pressed between finger and thumb offers no resistance at the centre.
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2
Drain the cooked beans, reserving their cooking liquid. Discard the garlic cloves and spent sage. In the same pot, warm the 80 ml of olive oil over a medium-low flame. Add the crushed garlic cloves and the fresh sage leaves. Cook steadily, without colouring the garlic too fast, for 10 to 12 minutes. The garlic must become sweet and golden throughout — raw garlic in the finished dish is a defect. The dish lives or dies here: an insufficiently cooked soffritto leaves a sharp, raw note that no subsequent step will correct; an overcooked one turns bitter. The cue is sight and smell together: the garlic is evenly pale gold, the sage has relaxed and perfumed the oil, and the kitchen carries a fragrance that is sweet rather than acrid.
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3
Add the crushed fresh tomatoes to the established soffritto. Raise the heat to medium and cook for 15 to 20 minutes only — no longer. Long cooking extinguishes the tomato's brightness, which is the counterpoint to the richness of the beans and oil. The tomato is ready when it has collapsed into a rough, vivid sauce that still carries the colour and sharpness of fresh fruit rather than the dark sweetness of a long-cooked ragù.
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4
Add the drained cooked beans to the tomato sauce. Stir gently to coat every bean. Add a little of the reserved cooking liquid if needed to loosen the mixture. Simmer together for a further 10 minutes, allowing the beans to absorb the sauce. Season with fine sea salt. The finished consistency is that of a thick, bean-studded tomato sauce — oily-saucy, not dry. The dish is ready when a spoon drawn through the centre closes slowly behind itself.
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5
Remove the pot from the heat. Pour a generous measure of extra-virgin olive oil over the surface — this final pour is made off the fire and is essential to the dish's character. Stir once. Serve directly from the pot, as a contorno alongside sausages or grilled meats, or as a course on its own with Tuscan bread.