Vending Machine Food

I found this at Nakau, a tiny restaurant/diner near my hotel, on my first night in Tokyo. I ordered it through a vending machine with pictures of menu options on buttons, handed the receipt to the waiter, and it was prepared for me within minutes. It was one of the most delicious dishes I've ever eaten, but I have no idea what it's called because the menu was all in Japanese! It's basically strips of beef on top of rice with some really, really good secret sauce. Does anyone know what it is so I can order it again in America? Everyday? For the rest of my life... japanese-vending-machine-food