Oni manjyu

I like oni manjyu, but I couldn't eat it all because I had no appetite. Today, I go to the beef barbecue restaurant with my grandfather, grandmother, mother, and brother after my brother's graduation ceremony. I want to eat a lot, but I can't. I'm very sad!
Why this sweets is called oni manjyu?? Because this is craggy, and looks like oni(ogre). I can't look it like ogre!