Motojiro is an old man who wants to teach you about mayonnaise! He can even tell you about how mayonnaise originated.
Mostly, he wants to tell you that Ajinomoto wins in taste tests. He also answers hard-hitting submitted questions such as "why is Ajinomoto mayonnaise so delicious?" submitted by a not at all suspiciously named Motoko! He can teach you about an absolutely foul sounding mayo hotdog too if you're into that.