If you travel outside of Buenos Aires you can find scores, probably hundreds of unique recipes. We've travelled all over the northeast provinces (Corrientes, Chaco, and Misiones) and have run into all softs of stuff...
Matambre a la pizza, flank steak sliced thin, topped with tomato sauce, mozzarella, and herbs, then baked
Pacu, dorado, and surubi a la pizza, these are 3 big types of fresh water fish that taste awesome.
Milanesa de pacu, dorado, surubi, chicken breast, and thinly sliced beef. Milanesa means lightly breaded and baked, I've had some terrible milanesa that was deep fried and greasy, but when its done right its light, crispy, and tasty.
All sorts of variations on chimichurris sauce
I've also eaten all sorts of wild game hunted by my in-laws including road runners, hares, carpincho, caimen. I'm sure they've slipped some other stuff I didn't know about into various stews and sauces too
