Matsuya is a chain of gyuudon ("beef bowl") restaurants in Japan. A Matsuya shop is easy to spot by its distinctive yellow sign and circular logo.
There are a few key factors that make Matsuya one of my main sources of nutrition:
1. Food: You get a lot of food, and it is tasty. You can go with the standard gyuudon bowl and miso soup, or you can opt for the curry. It's all good. Also, Matsuya offers kimchi, unlike other gyuudon shops. Dumping the kimchi on top of the gyuudon makes for an especially delicious meal. There are also pitchers of water on the table so you don't have to keep asking for more.
2. Price: You can fill up for 290 yen. As of 6/30/2002, that comes to US $2.42. In expensive-as-heck Tokyo, that's a downright miracle.
3. Service: Your order is placed by buying tickets out of a vending machine. This means your order will never get messed up. The folks that work there are friendly, and their "irasshaimase!"s and "arigatou gozaimashita!"s and "mata goriyou kudasaimase!"s sound pretty genuine. The speed is also nice; you can walk in, order, eat, and leave in a matter of 15 minutes.