Source: Based Cooking (community recipes)
Ragù is a long-cooked sauce-making built on rendered pork fat and slow caramelisation of aromatic-vegetables. This is the Bolognese logic: meat first, then the soffritto, then tomato — and time does the binding work.
Heat a Dutch oven over medium heat. Add the sausage without oil — it'll release its own fat as it breaks apart. Stir constantly for the first 3–4 minutes; you're looking for the meat to lose its raw sheen and the fat to pool in the base of the pan, not for browning. Once opaque throughout, add the onion, carrot, and celery. Turn the heat down to low. Stir every few minutes and add just enough olive oil to keep the pan from sticking — the vegetables need to soften and sweeten without any colour or char. This takes 25–30 minutes. You'll know it's done when the carrot is translucent and the whole soffritto smells sweet and concentrated, almost caramelised. Don't rush it.
Tip in the canned tomatoes with their liquid. Crush them against the side of the pan with a wooden spoon — you want irregular chunks, not a purée. Bring to a bare simmer, add the thyme and rosemary sprigs, then drop the heat to very low. Let it bubble gently, uncovered, for 20 minutes. The acid will soften and the surface will darken slightly as water evaporates.
Mix the tomato paste with 1 cup of hot water — this dissolves the paste evenly and prevents lumps — and pour it in. Stir well. Continue at a low simmer, still uncovered, for another 10–15 minutes. The ragù is ready when it's deep brick-red, thickened enough that the sauce clings to the back of a spoon, and small pools of red oil sit on the surface. This emulsification of fat and sauce is the mark of a finished ragù.
Fish out the herb sprigs. Season with black pepper. Cook the pasta in heavily salted water, drain it, and dress it in a serving bowl. Spoon the ragù over the top — don't drown it — and finish with grated Parmesan. A knob of cold butter stirred through at the last moment is good, too, though not essential.
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