Yes I was surprised there wasn't one already yet! Welcome 🤗
This one is the duck ramen from Ramen Maikagura in Tokyo
I'm sure the lemmy devs will add a way to unmod oneself. Worst case you can "retire" once we have some more mods in place. For now I'm glad the community exists.
I wouldn't say it's common but it's not unheard of either - if you search for "牡蠣ラーメン" there are several shops in Tokyo serving oyster ramen, including some that specialize in it! It's often combined with other shellfish and chicken/pork to make a shellfish-forward broth