Source: FOSS Cooking (community recipes)
Cut the aubergine lengthways into 1 cm slices. The striping is optional — it's visual, not functional — but if you want it, use a peeler to remove alternating strips before slicing. Toss the slices with 75 ml olive oil, salt, and pepper until well coated, then spread them across two baking trays lined with baking paper. Roast at 220°C fan until the flesh turns translucent and the edges are dark brown, around 30–35 minutes. This high heat drives off water fast, which concentrates the aubergine's natural sweetness and prevents a soggy final dish.
While the aubergine roasts, build the sauce. Heat the remaining 25 ml olive oil in a heavy-bottomed pot over medium-high heat. Add the minced garlic and whole chilli together — they're both alliums and aromatics that release their volatiles at the same temperature — and fry for 90 seconds until the garlic releases its sharpness. Pour in the tinned tomatoes, then add the oregano, caster sugar, and a pinch of salt. The sugar balances the acidity of the tin; the oregano adds a drying herbal note that works with roasted aubergine. Reduce the heat to low and let this sit for 20–25 minutes, stirring occasionally. You're not making a thick reduction — you want a sauce with body but enough liquid to coat the pasta, so aim for the consistency of single cream.
Bring a large pot of salted water to a rolling boil and cook the spaghetti to al-dente — usually 2–3 minutes less than the packet time. Drain, reserving 200 ml of the starchy cooking water. Fold the roasted aubergine into the sauce, then add the spaghetti and toss gently. The pasta water is your insurance: it's rich in starch, which emulsifies with the oil and creates a silky coating. Add splashes until the dish flows slightly on the plate without pooling.
Taste and season. Tear fresh basil into the bowl just before serving — heat breaks down its volatile oils, so it goes in last. This is a fasting-friendly dish that runs on technique, not richness: the roasting caramelises the aubergine, the sauce consolidates flavour through slow simmering, and the pasta water brings everything into suspension. No cream required.
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