Start by cutting the tri-tip steak into 1½-inch cubes for easy threading onto skewers. In a bowl, mix together the soy sauce, brown sugar, minced garlic, rice vinegar, and sesame oil to create a flavorful marinade. Toss the steak cubes in the marinade and let it sit in the refrigerator overnight for optimal flavor soaking, making sure to cover the bowl.

Once your steak has marinated, it's time to prepare the vegetables for your Hawaiian Beef Skewers. Cut fresh pineapple, red bell peppers, and sweet onion into 1½-inch pieces to ensure uniform cooking.

Take soaked wooden or metal skewers and begin threading them with the marinated beef cubes followed by pieces of pineapple, bell pepper, and onion. Alternate the ingredients to create a vibrant pattern.

Prepare the basting sauce by combining some of the reserved marinade with ketchup and honey. Mix well until smooth.

Preheat your grill to medium heat, around 350°F (175°C). Place the skewers on the grill and cook them for about 15 minutes, turning them every 2-3 minutes for even cooking.

Once grilled, remove the skewers. Garnish with sesame seeds and chopped green onions for flavor and visual appeal. Serve hot alongside your favorite sides.