In a small bowl, whisk together the gochujang paste, tamari, rice vinegar, minced garlic, and grated ginger to create the glaze.
Place the diced pork belly in a cold skillet, then turn the heat to medium and cook until the fat renders and the pieces are golden and crispy.
Remove the crispy pork belly with a slotted spoon, leaving the rendered fat in the pan, and add the thinly sliced pork tenderloin.
Sear the tenderloin for 2-3 minutes per side until cooked through, then pour in the gochujang glaze and toss until the meat is sticky and well-coated.
In a separate pan, sauté the cauliflower rice with the toasted sesame oil for 4-5 minutes until tender and slightly toasted.
Divide the cauliflower rice into a bowl and top with the glazed tenderloin, crispy pork belly, sliced cucumber, and kimchi.
Garnish with thinly sliced green onions and white sesame seeds before serving.