Dice the pork tenderloin and pork belly into small, uniform half-inch cubes.
Heat a large cast-iron skillet over medium-high heat and add the pork belly, rendering the fat until the pieces are golden and crispy.
Add the pork tenderloin to the skillet, seasoning with sea salt and black pepper, and sear until cooked through and browned on all sides.
Stir in the minced garlic, grated ginger, and sliced green onions, sautéing for one minute until fragrant.
Add the cooked brown rice, riced cauliflower, and chopped kimchi to the pan, pressing the mixture down firmly with a spatula.
Allow the rice to fry undisturbed for 3-4 minutes to develop a crunchy, caramelized crust on the bottom.
Drizzle with tamari and toasted sesame oil, then toss everything together to combine the flavors.
Clear a small space in the center of the pan, crack the egg into it, and scramble gently until just set before folding it into the rice.