Beef Tongue Lunch Box in Shinkansen

When I visited to Osaka, I took Shinkansen.
As it was almost just noon, I bought Lunch Box of beef tongue.

Beef tongue is very popular in Japan, especially for "Yaki-Niku".
Different from other meat such as roast, diaphragm, sparerib, beef tongue is bit of to hard to chew and I think it is so delirious.