Fagioli all'Uccelletto, cannellini beans boiled and then simmered in tomato sauce with herbs, is a universal Tuscan dish, and Andrea Gagnesi, who (among other things) teaches cooking at Badia a Coltibuono, points out that no two versions are precisely the same, and that most everyone says his, or her, or grandma's version is the real deal, and that everything else pales by comparison.
What counts, Andrea also says, is that the beans be good, and his were very nice.

