3 spaghetti all chiarello Recipes

pancetta, in 1 piece and partially frozen, extra virgin olive oil, onion, thinly sliced, red pepper flakes, fresh italian parsley, chopped, red wine vinegar, tomato puree, spaghetti, romano cheese , for serving

pancetta in 1 piece, partially frozen, extra-virgin olive oil, onion, thinly sliced, scant 1/4 tsp red pepper flakes, chopped fresh italian parsley leaves, red wine vinegar, tomato puree, spaghetti or bucatini, freshly grated parmesan (recommended : pecorino romano)