Cut the pork belly into 1-inch cubes and place them in a medium glass bowl.
In a small jar, whisk together the gochujang, tamari, toasted sesame oil, rice vinegar, raw honey, grated fresh ginger, and minced garlic.
Pour the marinade over the pork cubes and toss thoroughly to coat, then let marinate for 20 minutes at room temperature.
Thread the marinated pork onto skewers, leaving a small amount of space between each cube for even cooking.
Preheat a grill or grill pan to medium-high heat and cook the skewers for 3-4 minutes per side until the fat is rendered and the edges are charred.
While the skewers cook, toss the sliced cucumbers with sea salt and black pepper in a small bowl to create a cooling side salad.
Remove the skewers from the heat, sprinkle with sesame seeds, and serve immediately alongside the fresh cucumber salad.