This is a decorative item for a Children's Day themed bento or lunch. These sausage are made easily by using a straw to make the cuts.
I was trying to figure out how to make the scales easily on sausage koinobori.
I use 1 whole wiener sausage, but you can also slice it in half lengthwise to make 2 koinobori out of 1.
Enjoy Japanese food around the world.