Soak four wooden skewers in water for at least 20 minutes to prevent burning during the grilling process.
In a small bowl, whisk together the gochujang, coconut aminos, toasted sesame oil, honey, rice vinegar, grated ginger, and minced garlic until smooth.
Cut the pork tenderloin and pork belly into 1-inch cubes and place them in a bowl with the zucchini half-moons and bell pepper chunks.
Season the pork and vegetables with sea salt and black pepper, then toss with half of the prepared gochujang marinade.
Thread the pork and vegetables onto the skewers, alternating between the lean tenderloin, rich pork belly, and fresh produce for balanced flavor.
Preheat a grill or cast-iron grill pan over medium-high heat and lightly grease with a high-smoke point oil.
Grill the skewers for 8 to 10 minutes, turning occasionally, until the pork is cooked through and the edges are beautifully charred.
During the final 2 minutes of grilling, brush the remaining gochujang sauce over the skewers for a thick, glossy finish.
Remove from heat and garnish with toasted sesame seeds and sliced green onions before serving immediately.