Cut the pork tenderloin into 1-inch cubes and place them in a medium glass bowl.
In a small jar, whisk together the gochujang, tamari, toasted sesame oil, raw honey, rice vinegar, minced garlic, and grated ginger.
Pour half of the marinade over the pork cubes, tossing to coat thoroughly, and let it marinate for at least 20 minutes in the refrigerator.
Cut the red bell pepper into 1-inch squares and the green onions into 1-inch segments.
Thread the marinated pork onto skewers, alternating with the pieces of red bell pepper and green onion.
Heat a grill pan or outdoor grill over medium-high heat and lightly coat with a high-heat cooking spray.
Grill the skewers for 3-4 minutes per side, brushing with the remaining marinade during the last few minutes, until the pork is cooked through and the glaze is sticky.
Remove from the heat and sprinkle with sesame seeds, sea salt, and black pepper before serving hot.