Ramen is served with various flavours, and there are 4 typical flavours of Ramen soup: Shoyu (soya sauce base), Shio (salt base), Miso (miso paste base) and Tonkotsu (pork broth base).
In the past decade, Tonkotsu Ramen has become the mainstream of the Ramen trend, not only in Japan but also around the world. ICHIRAN and IPPUDO are two most famous franchised Japanese Ramen shops which have numbers of branches worldwide. Both restaurants serve an authentic Hakata style Tonkotsu Ramen from Kyushu region where Tonkotsu soup originated. Rich and creamy pork broth soup is so appetizing and very much satisfying, and Tonkotsu Ramen is a must-try dish for many visitors to Japan today.
There are hundreds of Ramen restaurants in Tokyo, and as I mentioned above, especially Tonkotsu Ramen has been the most popular and common type of Ramen flavour today. Most popular Tonkotsu Ramen restaurants in Tokyo are arguably ICHIRAN and IPPUDO who are already well-known around the world, but there is another Tonkotsu Ramen restaurant which is becoming as popular as these two restaurants.