T's Tantan is probably the most famous and popular vegan restaurant in Tokyo, and it’s for a good reason. Every time I visited, the ramen is reliably delicious at a reasonable price.
The Tokyo Station branch can be a bit tricky to find, follow the signs for the Keiyō line train (the red coloured JE line) until you reach the escalators marked "Keiyō line (direction for Maihama)," and T’s Tantan will be on the right of that. This popular spot has a constant queue, so if you can, go to the less busy branches at Ueno or Ikebukuro Stations, or their flagship restaurant in Jiyugaoka.
For first-timers, go for the golden tantan noodles. The rich, creamy broth packs flavours. With toppings of soy mince, sesame, peanut butter and veggies, this ramen is satisfying and delicious at just 1,100 yen. They also offer other bowls like black sesame tantan ramen and yuzu ramen. For something extra, add three gyoza for 320 yen.
In addition to the dine-in menu, T's Tantan has some takeaway options that make a perfect meal to take on the Shinkansen bullet train. Options include a soy meat bento box or a 10-piece gyoza bento for 1,000 yen each.