Harajuku Gyozaro (原宿餃子樓) has my favorite fried dumplings (gyoza) in the world. Seems like it’s always busy, but people don’t tend to stay; they eat and leave. I found it during my first trip to Tokyo and I find myself eager to immediately return every time I go back. 

Address: 神宮前6-2-4 (岡島ビル), Shibuya, Tōkyō, 150-0001, Japan