Whisk together soy, oil, garlic and 2 tablespoons of the ginger in a baking dish. Add the ribs and turn to coat. Cover and let marinate in the refrigerator for at least 30 minutes and up to 4 hours.
Heat grill to high. Season ribs with salt and pepper and grill about 3 to 4 minutes per side, until tender. Brush the onions with oil, season with salt and pepper and grill for 2 to 3 minutes on each side, until tender.
Whisk together the vinegar, remaining tablespoon of ginger, honey, sesame oil and olive oil in a large bowl and season with salt and pepper. Coarsely chop the green onions and add to the bowl. Add mint leaves, mizuna and or watercress and toss to coat.
Recipe courtesy of Bobby Flay, 2008