Cube the pork tenderloin and pork belly into 1-inch pieces.
In a small bowl, whisk together the gochujang paste, coconut aminos, sesame oil, honey, grated fresh ginger, minced garlic, sea salt, and black pepper.
Toss the pork pieces in the marinade until well coated and let sit for at least 15 minutes to absorb the flavors.
Chop the red bell pepper into 1-inch squares and cut the green onions into 1-inch lengths.
Thread the pork and vegetables onto skewers, alternating between the lean tenderloin, the rich pork belly, and the fresh vegetables.
Heat a grill pan or outdoor grill to medium-high heat.
Grill the skewers for 3 to 4 minutes per side until the pork is cooked through and the edges are beautifully charred.
Serve the skewers immediately while hot and sizzling.