This is excellent served with fresh pasta. To lessen the bitterness, soak the radicchio wedges in ice water for 1 hour and drain well.
Cook in a large skillet over medium heat until crisp, about 5 minutes:
Transfer the meat to a plate with a slotted spoon and, if necessary, pour off all but 2 tablespoons of the fat. Increase the heat to medium-high and add:
Cook until browned on both sides and transfer to the plate with the pancetta or bacon. If needed, add a bit more olive oil to the skillet and cook, stirring, until softened, about 5 minutes:
Return the pancetta or bacon and radicchio to the skillet and add:
Simmer over medium heat until the wine is evaporated, turning the radicchio once or twice. Pour in:
Simmer for about 3 minutes, scraping up any browned bits in the skillet. Serve sprinkled with: