If using wooden skewers, soak them in water for at least 20 minutes to prevent burning.
Cut the pork tenderloin and pork belly into 1-inch cubes. Slice the zucchini into thick half-moons and the red bell pepper into 1-inch squares.
In a small bowl, whisk together the gochujang, coconut aminos, toasted sesame oil, grated ginger, and minced garlic to create the marinade.
Place the pork cubes in a bowl and toss with half of the marinade, sea salt, and black pepper. Let it sit for 10 minutes.
Thread the pork tenderloin, pork belly, zucchini, and peppers onto the skewers, alternating between the meat and vegetables.
Heat a grill pan or outdoor grill over medium-high heat. Lightly grease the grates.
Grill the skewers for 3-4 minutes per side, or until the pork is cooked through and the vegetables are charred. Brush the remaining marinade over the skewers during the last 2 minutes of cooking.
Remove from heat and let rest for 3 minutes before serving.