Aside from David Cross’s favorite, Minca, Momofuku pretty much has the lock on the ramen market. But this Wednesday Setagaya, the first U.S. outpost of a beloved Tokyo chain (more of them will pop up here and in Boston) will go up against the Goliath with what manager Charlie Huh insists is 100 percent natural ramen made from 90 percent Japanese ingredients. Asked about Momofuku, Huh says, “They get mostly American customers. Japanese people do not go to that place. They’re pretty good — but…