Mentaiko refers to a salted cod's roe spiced with red pepper. It's one of the Fukuoka specialties and is loved by not just Fukuoka locals but Japanese people in general. What is special about Mentaiko is that it can be eaten as is or used as pasta sauce. Mentaiko Spaghetti is a super popular dish. If you can't wait till your next Japan trip, find recipe online and make one at home.