Soak wooden skewers in water for at least 20 minutes to prevent them from burning on the grill.
In a medium mixing bowl, whisk together the gochujang, tamari, sesame oil, honey, grated ginger, and minced garlic until smooth.
Slice the pork tenderloin into 1-inch cubes and toss them in the marinade until well-coated, then let them marinate for 15 minutes.
Alternately thread the marinated pork cubes, red bell pepper chunks, and green onion pieces onto the prepared skewers.
Lightly season the assembled skewers with sea salt and black pepper.
Preheat a large grill pan or outdoor grill over medium-high heat and lightly grease with a drizzle of oil.
Grill the skewers for 3 to 4 minutes per side, turning occasionally, until the pork is cooked through and the glaze is sticky and charred.