My mom used to pack this dish in my bento. It's one of my favorite dishes since I was a kid.
They're delicious fresh but also taste great cold.

It's super easy.
You will finish deep-frying in 1-2 minutes.
While deep-frying, they will float to the surface, so flip them over and deep-fry until both sides become brown.
You can also use flour → eggs → panko bread crumbs for coating. Recipe by Plus Nine