Soak wooden skewers in water for 20 minutes to prevent burning during the grilling process.
Cut the pork tenderloin into 1-inch cubes and place them in a medium mixing bowl.
In a small bowl, whisk together the gochujang, tamari, honey, sesame oil, grated ginger, and minced garlic.
Pour half of the gochujang marinade over the pork cubes, tossing well to coat, and let marinate for 15 minutes.
Chop the red bell pepper and zucchini into 1-inch pieces suitable for skewering.
Thread the marinated pork and vegetables onto the skewers, alternating between the meat and the produce.
Preheat a grill pan or outdoor grill to medium-high heat and lightly coat with a high-heat cooking spray.
Grill the skewers for 3 to 4 minutes per side until the pork is cooked through and the vegetables are tender.
Brush the remaining marinade over the skewers during the final minute of cooking to create a sticky glaze.
Remove from heat and garnish with toasted sesame seeds and thinly sliced green onions before serving.