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1
Dissolve the saffron threads in 100–120 ml of warm water and leave to steep for 10 minutes, so the water turns evenly and deeply golden throughout — undissolved saffron gives the finished dough patchy colour and uneven flavour. The liquid must be fully saturated before it goes near the flour; if it still looks pale, give it another minute or two.
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2
Combine the semola rimacinata and salt in a bowl, then add the saffron water gradually, mixing until a dough forms. Turn onto a work surface and knead for 10 minutes, working until the dough is firm and smooth — a dough that feels soft and yielding will slacken further when ridged and then collapse into itself during boiling. Wrap and rest for 30 minutes so the semolina fully hydrates and the dough becomes pliable enough to roll without tearing.
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3
Divide the dough and roll into ropes of 1 cm diameter, then cut into 1 cm lengths. Press and roll each piece across a rigagnocchi board or the back of a fork with light downward pressure to produce the characteristic ridges and hollow — this is where the dish lives or dies, because without those ridges the sauce has no purchase and the pasta is not malloreddus. Work at an even pace; if the pieces warm and soften, rest them briefly before continuing.
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4
Warm the olive oil in a wide pan over medium heat, add the crumbled sausage, and cook, stirring, until lightly browned on all sides, so the fat renders out into the pan and the meat takes on a pale golden crust that will give the finished ragù its depth and body. Do not rush this stage — a pan crowded with meat that steams rather than colours will produce a flat, grey sauce.
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5
Add the sliced onion to the pan and cook until softened and translucent, 5–7 minutes, so it melts into the fat rather than sitting as a separate presence in the finished sauce. Add the crushed tomatoes and basil, then simmer uncovered for 30 minutes, stirring occasionally, until the sauce is deep red, dense, and no longer watery — it should fall heavily from the spoon rather than run. Season with salt.
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6
Bring a large pot of abundantly salted water to a full boil and cook the malloreddus for 8–10 minutes — salt the water generously, because semolina pasta absorbs seasoning less readily than egg pasta and will taste flat if the water is timid. They are done when they rise to the surface and offer a firm but yielding resistance when pressed between the fingers, semolina-firm, not soft.
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7
Drain the malloreddus and dress immediately with the campidanese ragù, tossing to coat each piece while both are still hot so the sauce clings into the ridges rather than pooling at the bottom of the bowl. The golden pasta should be evenly cloaked in the deep red sauce, with the ridges visibly filled; finish with a generous grating of Pecorino Sardo Stagionato over each portion.