200 grams guanciale or pancetta or streaky bacon, rind removed and sliced into 2 cm strips no more than 3 mm thick (guanciale gives it a meatier flavour)
1 medium sized onion, finely chopped (optional)
3 tins each 400 grams tinned whole peeled tomatoes, preferably San Marzano, removed from the juice (discarded) and cut into 4 pieces with the seeds removed and discarded or 1 litre tomato passata
1 dried chili or a pinch of chili flakes
60 grams pecorino romano, finely grated
350 grams bucatini, maccheroni alla chitarra, vermicelli, or rigatoni
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