Place the meat in a large baking dish. Combine the garlic, soy sauce and mirin in a small bowl and pour it over the steak. Marinate for 30 minutes, turning occasionally.
In a small bowl, dissolve the sugar in the vinegar. Arrange the daikon, carrot and ginger in a large bowl and pour the vinegar over it. Set aside for 5 to 10 minutes. Drain and squeeze o