Soft-shelled turtle soup stock is a strong punch! Menya Musashi's "Yakuzen Ramen"-Suppon dumplings are also fierce horses [Kinno Musashi 11]
Menya Musashi's 20th Anniversary Project "Kinno Musashi", the 11th edition, is "Yakuzen Ramen", where the soft-shelled turtle dashi has a strong punch. I have been tasting "Yakuzenra-Noodles" in Ikebukuro and Niten.