Of course you can cook GYUDON at home but there are many GYUDON fast food chains.
It is very popular, especially for office workers who want to have a short lunch and use their time efficiently because Gyudon is served in a minute and costs only a few dallers. But even though it is served quickly and at a reasonable price, people wouldn't eat it if it tasted bad, would they? You don't have to worry about it. People love its taste.
Today there are a variety of GYUDON chains and they serve lots of kinds of GYUDON. Why don't you try a Japanese people's favorite?