I was back twice more to Barbacco Eno Trattoria this past week with two different groups. Although they were not on the menu on my earlier visits, a Brussel sprouts (Cavolini di Bruxelles) dish with garlic, lemon, and some of Barbacco's own pancetta, has since appeared and we had it on both of our most recent visits.
Everyone who tried it – even avowed Brussel sprouts haters – agreed it was fantastic. I am not sure how they make them, but they must first steam or boil them to partially cook them and then fry them to finish them off. A definite must have on any visit!
I have seen that similar dishes are apparently served at a few other Italian restaurants around town (e.g. SPQR and Delarosa) and would welcome any comments from anyone who has had them elsewhere. I also welcome any comments as to whether this may be a traditional Italian preparation for Brussel sprouts.