Preheat the grill to medium-high heat (about 450 dgrees F).
In a large bowl, mix the beef, panko, onion, egg, soy sauce, hoisin sauce, chili sauce, salt, garlic powder, and ginger until well combined. Form the mixture into 4 patties. Place on the grill and cook for 3 to 4 minutes on each side, for medium. Remove from the grill and let rest for 5 minutes.
Meanwhile, mix the coleslaw with the Sriracha sauce and set aside.
Serve each burger on a bun with spicy slaw.
Notes
If you do not have a grill, heat about 2 tablespoons olive oil in a grill pan or large skillet over high heat. Place the burgers in the pan and cook as directed.