Can anyone help me replicate very thin sliced pork loin with carmelized onion I had in Tuscany?

[Kikim]

I tried googling recipes, but could not really find anything. This dish was made for us at our agisturismo and was phenomenally delicious-- I have no idea if it is a regional Tuscan specialty or just something the owner came up with-- I was hoping this is a dish others may recognize.

The pork was very, very thinly sliced-- like a cold cut-- I think it was loin but I could be wrong. It was in a very light sauce, with some type of cooked down onion warm relish. I am sure there were other herbs and seasonings but cannot recall. Does this dish sound familar to anyone?

Thanks!