In a small bowl, whisk together the gochujang, tamari, toasted sesame oil, rice vinegar, minced garlic, and grated ginger to create the spicy glaze.
Heat a large non-stick skillet over medium-high heat and add the finely diced pork belly, cooking until the fat renders and the bits become golden and crispy.
Add the cubed pork tenderloin to the skillet with the pork belly, seasoning with sea salt and black pepper, and sear for 5-6 minutes until cooked through.
Pour the gochujang glaze over the pork mixture and toss for 1 minute until the sauce is bubbly and has thickened to coat the meat.
In a separate pan or microwave-safe bowl, lightly steam the cauliflower rice until tender but still holding its shape.
Divide the cauliflower rice into a bowl and top with the glazed pork, tangy kimchi, and sliced cucumbers.
Garnish the bowl with thinly sliced green onions and serve immediately while hot.