This is simply seasoned with salt and mirin. It's a Kyoto-style stewed dish that brings out the taste of the ingredients. It'll warm you up!
This is a Chinese cabbage version of "Kyoto Style Potherb Mustard and Abura-age Mixed Soup" (Recipe ID: 1632309). I thickened the soup and created an ankake dish.
Enjoy Japanese food around the world.