1-First Step: Prepare all ingredients by cubing the beef sirloin into bite-sized pieces, mincing garlic, and grating ginger. For dietary adaptations, prepare tofu or tempeh similarly if vegan.

2-Second Step: In a mixing bowl, combine teriyaki sauce, garlic, ginger, and olive oil. Adjust ingredients for gluten-free or low-calorie options as needed.

3-Third Step: Marinate the beef cubes in the sauce mixture for at least 30 minutes, allowing flavors to infuse thoroughly. Combine the beef slices with the teriyaki sauce and sesame oil in a medium bowl and stir to coat well, then let it sit as directed.

4-Fourth Step: Soak wooden skewers in water for 15 minutes to prevent burning.

5-Fifth Step: Thread the marinated beef onto the skewers, leaving slight space between pieces for even cooking. Use 8-inch skewers for the best results.

6-Sixth Step: Preheat grill or grill pan to medium-high heat (about 400°F or 200°C). Grease it with cooking oil to prevent the skewers from sticking.

7-Seventh Step: Cook the skewers for about 3-4 minutes on each side until beef is cooked to desired doneness. Adjust cooking time if using tofu or tempeh.

8-Final Step: Remove from grill, sprinkle with toasted sesame seeds for garnish, and serve immediately. Serve the skewers hot, garnished with chopped green onions for an extra pop of flavor.