Today I ate "Umatoma Cheese iri Hamburg (Delicious tomato with cheese in hamburger steak )".
I bought it at Matsuya. Matsuya is one of famous Gyuudon restaurants in Japan, I think Matsuya is the best of them. But I always eat hamburger steak at Matsuya.
In my opinion, cheese on hambuger steak is the best. Cheese with hamburger steak is my favorite combination but in this time, I couldn't enjoy its cheese taste ! It is a pity !