400g/14oz spaghetti
salt and freshly ground black pepper
2 free-range eggs, plus 4 free-range egg yolks
90g/3录oz grana padano or parmesan, grated, plus 30g/1oz to serve
50驳/1戮辞锄 pecorino romano, grated, plus 30g/1oz to serve
400g/14oz guanciale or pancetta, rind removed, cut into 5mm/录in slices and chopped into thick strips