If you need to, start out by charging a dollar or two more if that allows you to give good food!
This Gyudon is flavoured by a sauce that's subpar, and topped with very little beef.
Here's an alternative: give less rice, focus on cooking the beef right, and give customers just 50g more beef.
It was full-house when I went, but the pre-packed broth and the lacklustre food didn't deserve this attention.