Peel the sweet potato. Chop in small pieces and soak in water.
Drain water and put in heatproof container, then cover with plastic wrap to microwave until soft.
Heat some vegetable oil in a frying pan. Stir-fry pork and season with salt and pepper.
Mash the sweet potatoes while hot. Combine with pork and mix well.
Form into flat patties. Coat thinly with katakuriko. Dredge in beaten eggs and coat with panko.
Deep-fry until golden brown.
They should be done as soon as they're browned on the outside since the inside is already cooked.
Story Behind this Recipe
My mother used to make these quite often. At my parent's place, they preferred ground chicken, but our family prefers ground pork because my husband loves heavy meals.
Try these out with ground chicken as well -- they'll turn out tasty and light. If you use katakuriko (corn starch), you'll be able to shape them without difficulty. Even children can help you because it's so easy to shape. The heart-shaped ones were made by my son. Your kids can make mini-sized croquettes that'll be perfect for bentos! If you make a lot and freeze before frying, they'll save you time the next time you want to make them.