Mentai butter udon combines springy udon noodles with pollock roe, melted butter, and a touch of heat for a savory, umami-packed bowl. The roe bursts with briny flavor that cuts through the richness of the butter sauce, setting it apart from plainer versions. Noodles arrive hot and slurpably chewy, with the sauce emulsified smoothly around them. This dish captures nostalgic Japanese diner appeal in every bite.