I was initially wary of trying the shoyu ramen; worrying it might be too salty. Thankfully, my worries were in vain.
Chabuton's Shoyu Ramen is delicious; its finely sliced Japanese leeks adding a subtle fragrance to the savory Japanese soy broth that was not lost on me.
The thin and flat ramen noodles were softer than I would've liked. I recommend opting for the thin springy ones instead (they serve it in the Shio Ramen). Apparently, different types of ramen noodles are used for different options. It's not conveyed in the menu, nor by the staff, but you could try asking them. The right noodles makes all the difference.