Buon Giorno,
If I had to select only one favorite Italian Dish, then, I would choose Lasagne al Bolognese di Emilia Romagna ...
My 2nd choice is: Cassola alla Pesce di Sardinia ...
On the current restaurant scene in the Madrid Capital, we go to Scatto Matto (Check Mate) and Caffé Poetti, both owned by Sardinian native Ignazio Deia. We have tried numerous Italian venues in Madrid, and these are the only two, I would recommend.
In Tuscana, Gambero Rossi is a favourite venue of our´s.
Ciao.
M.C.
J & G