Press your thumb into centers of patties, before grilling, for burgers that cook up flat, rather than domed, across the top.
Stir together first 6 ingredients. Reserve 3 Tbsp. mixture; cover and chill. Pour remaining soy sauce mixture into a shallow pan or baking dish.
Shape beef into 8 (1/2-inch-thick) patties; place in a single layer in soy sauce mixture in pan, turning to coat. Cover and chill 4 hours.
Preheat grill to 350° to 400° (medium-high) heat. Remove patties from marinade, discarding marinade. Grill patties, covered with grill lid, 5 minutes on each side or until beef is no longer pink in center, basting occasionally with reserved 3 Tbsp. soy sauce mixture.
Stir together chili sauce and jelly. Serve burgers on buns with chili sauce mixture and desired toppings.