Animelle di vitello (veal sweetbreads) in Roman resaurants
Sweetbreads are one of my favorite bits of offal, along with liver and tongue. In browsing through the postings, particularly on places in Testaccio, notably Checchino dal 1887, such dishes seem uncommon. Tripe gets a mention along with pagliata (calf intestine), but the other offal is absent. Given the historic meat-packing character of Testaccio this absence seems surprising.
Are there any Roman restos that specialize in sweetbreads?
I agree with your enthusiasm - Ive had animelle at trattorie in rome, most memorably at Trattoria Monti , with funghi porcini (not a traditional roman place) but in my experience it mostly appears as a daily special and not as a regular menu item. Hopefully the Romans will comment on where it is more frequently found. It also may be worth asking when not listed - it may be an off menu special
did a quick search and found references to animelle dishes as La Campana, Il Pompiere and La Matricianella - heres a link to the last reference
here is another link fwiw
Vicolo della Campana, 18, Roma, IT 00186, IT
Via di Santa Maria de' Calderari, 38, Rome, Lazio 00186, IT