Gyozas are dumplings made from rice dough that are normally filled with pork, but they can also be filled with veal or other ingredients.
In Harajuku you can enjoy really great cooked or fried gyozas at a very affordable price. On my first trip to Japan I wasn't able to try them there, and on this last trip, I could only go one day. I would have liked to have gone there many times. I also recommend trying the moyashi, a soy dish with minced meat and a special sauce. It is delicious.
The place is always packed and apparently at night it is fairly common to have to wait. We went for lunch and the tables were all occupied, but there was room at the bar.