Roughly chop the boiled soy beans, and finely mince the ● ingredients. If using a food processor, only use it in short bursts, taking care not to turn the soy beans into a paste.
Combine the ◎ ingredients with Step 1 and form into paddies. Cook in a frying pan coated with a thin layer of olive oil. Cover with a lid and cook each side for 4 minutes. Do not touch them until they've browned.
In the same frying pan, add the ketchup and Japanese-style Worcestershire sauce. Mix together and lightly heat, taking care not to burn it. Pour over the hamburger.
Try eating this a la hamburger style with lettuce, tomato and mayonnaise between two buns. It's really delicious.
Story Behind this Recipe
I roughly diced soy beans in a blender, and mixed them with some okara from handmade tofu that I wanted to use up. Chunky okara gives it a nice texture and can be used as a substitute for ground meat. It can also be stored in the freezer.
It's convenient if you roughly chop plenty of boiled soy beans in a food processor, flatten them, and then store them in the freezer. I used this amount of soy beans because they're packaged this way, the okara amount is based on how much leftover I have from making homemade tofu. If you don't have oatmeal, use "fu" (dried wheat gluten), flour, or panko bread crumbs.