Cut the pork loin and pork belly into 1-inch cubes.
In a small bowl, whisk together the gochujang, coconut aminos, sesame oil, rice vinegar, honey, minced garlic, and grated ginger.
Place the pork cubes in a glass bowl and toss with half of the marinade, sea salt, and black pepper.
Let the pork marinate for at least 15 minutes to absorb the flavors.
Cut the red bell pepper into 1-inch pieces and the green onions into 1-inch batons.
Thread the pork loin, pork belly, peppers, and green onions onto skewers, alternating pieces.
Heat a grill pan or cast-iron skillet over medium-high heat and lightly coat with a touch of oil if needed.
Sear the skewers for 3-4 minutes per side until the pork is cooked through and the edges are charred and crispy.
Brush the remaining marinade over the skewers during the last minute of cooking for a glossy finish.