Why didn't I see these a few weeks ago for Boy's Day?! They would have been the perfect thing to make for the holiday. Oh well, at least I'll be prepared for next year.
Want to make some of your own cute koi fish jelly roll cakes? Stop by Junko's site for the decorating how-to (recipe not included). The site is in Japanese so here's the translated version if you need it. Besides this koi fish cake, you'll find instructions for other jelly roll cakes. Happy Baking!
Update: Jelly Roll Recipe
I just noticed the translated version isn't showing all the pictures. Not sure why that's happening. Click on the untranslated version "Junko's site" for the step by step pictures.