Prepare the glaze by whisking together the gochujang, tamari, toasted sesame oil, raw honey, grated ginger, and minced garlic in a small bowl.
Cut the pork tenderloin and pork belly into uniform 1-inch cubes and place them in a glass bowl.
Pour half of the gochujang glaze over the pork, tossing well to coat, and let it marinate for at least 15 minutes.
Chop the red bell pepper and zucchini into chunks similar in size to the pork pieces.
Thread the marinated pork tenderloin, pork belly, peppers, and zucchini onto skewers, alternating items for even cooking.
Season the assembled skewers lightly with sea salt and black pepper.
Heat a grill pan or outdoor grill over medium-high heat and lightly grease with a touch of oil.
Grill the skewers for 3-4 minutes per side, or until the pork is cooked through and the edges are beautifully charred.
During the last minute of cooking, brush the remaining glaze onto the skewers to create a glossy, flavorful finish.