Soak wooden skewers in water for 20 minutes to prevent burning during the grilling process.
Cut the pork tenderloin and pork belly into uniform 1-inch cubes for even cooking.
In a medium bowl, whisk together the gochujang, tamari, sesame oil, grated ginger, minced garlic, rice vinegar, and honey.
Add the pork cubes to the bowl and toss until every piece is thoroughly coated in the spicy glaze.
Thread the pork onto the skewers, alternating between the lean tenderloin and the rich pork belly pieces.
Preheat a grill or grill pan to medium-high heat.
Grill the skewers for 3 to 4 minutes per side until the pork is cooked through and has a beautiful charred exterior.
Slice the cucumber into thin rounds and toss them with sea salt and black pepper in a small bowl.
Serve the hot skewers immediately over the bed of crisp cucumbers and garnish with a sprinkle of sesame seeds.