Method
- Cook onions very gently in olive oil with a pinch of salt until soft and sweet.
- Add anchovies and let them dissolve into the onions.
- Boil pasta until al dente.
- Toss pasta with the sauce, loosening with pasta water.
- Finish with black pepper and parsley if desired.
- Serve without grated cheese.
Cook's note: Do not rush the onions. Their sweetness is what balances the anchovy.