How to Cook Beef Tongue Why eat beef tongue? Like other organ meats, it is very nutrient dense. It is an excellent source of vitamin B12, and B12 deficiency may be much more prevalent than currently estimated. It's also a good source of B2, B3, and choline, and provides some B5 and B6. It is also an excellent source of zinc, and a good source of iron, phosphorus, and selenium (source).