Halve the lime and squeeze the juice. Peel and finely chop the onion. Peel garlic and press it through a press. Put Panchetta in portions in a cold coated pan and heat it up.
As soon as the pancetta fat starts to melt, place a pan on the slices to keep them flat. Fry the pancetta for 3-4 minutes while turning it until crispy. Remove and drain on kitchen paper.
Prepare the pasta in boiling salted water according to the instructions on the packet. Add onions and garlic to the pancetta fat and fry for about 2 minutes until transparent. Add cream and lime juice and simmer for about 8 minutes, stirring occasionally.
Wash parsley, shake dry and cut the leaves of 2 stems into thin strips. Carefully halve 2 slices of Pancetta. Coarsely crumble the remaining pancetta. Drain the pasta. Season the sauce with salt, pepper and a little sugar.
Mix the pancetta crumbs, noodles, sauce and parsley strips and arrange on plates. Garnish with pancetta halves and parsley leaves.