1.

Trim beef tri-tip of excess fat. Combine other ingredients, except sesame seeds and mix well. Place beef tri-tip in a resealable plastic bag and cover with oriental marinade. Refrigerate for several hours (up to 8). Preheat grill. Remove beef tri-tip from marinade and discard marinade. Grill beef tri-tip over medium heat, turning occasionally for about 25 to 30 minutes depending on thickness of the cut. When done, remove from grill and let rest for 5 minutes. Carve across the grain, sprinkle with sesame seeds, spring onion and serve.