Japanese Hamburgers Kill

My mom makes these killer Japanese Hamburgers. It's weird because when I think of hamburgers I think of burgers and just solid juicy beef patty in between rolls but these are like meat blobs but they aren't juicy like fat American juicy. 

These burgers are sooooo different than anything I've had. We top it with Japanese katsu sauce, they go so well together.  For the skinny people, these are not juicy fat burgers, they are so lights when you eat them you don't even think you're eating burgers (that's what the Japanese diets are for).