what is also called net's tongue and used in the garnish À la zingara?
À la zingara:  "gypsy style"), sometimes spelled as à la singara, is a garnish or sauce consisting of chopped ham, tongue, mushrooms and truffles combined with tomato sauce, tarragon and sometimes madeira. Beef tongue: Beef tongue or neat's tongue is a dish made of the tongue of a cow.
Beef tongue