Shoyu Ramen is a type of Japanese ramen. It has a soy sauce broth, and the noodles are often thicker than Tonkotsu Ramen. You will find many Shoyu Ramen shops in the Kanto area like Tokyo. Just like Miso and Shio, Shoyu is one of the key ingredients of Japanese cuisine. If you'd like to make it at home, find recipes online.