There is a large Basque community where I grew up and marinated beef tongue is a favorite with them. I like it too. The tongue is first boiled and sliced very thin and then marinated in red wine vinegar, garlic, and olive oil. To get more info google Woolgrower's restaurant pickled tongue recipe.
Ohmagherrd! that pickeled dish is good. That and a picon punch.
Literally had a tear in my eye when the Traditional Basque restaurant I grew up eating at locally shut down in 1994.
