Prepare the proteins by cutting the pork tenderloin into 1-inch cubes and finely dicing the pork belly into small bits.
Place the pork belly bits in a cold skillet and turn the heat to medium-high, cooking until the fat renders and the bits become golden and crispy.
Add the cubed pork tenderloin to the skillet, seasoning with sea salt and black pepper, and sear until all sides are browned and cooked through.
Stir in the minced garlic and grated fresh ginger, sautéing for 60 seconds until highly fragrant.
In a small bowl, whisk together the gochujang, coconut aminos, and toasted sesame oil, then pour the mixture over the pork to glaze it evenly.
Add the cauliflower rice and baby spinach directly to the skillet, tossing constantly for 2-3 minutes until the spinach is wilted and the cauliflower is tender.
Transfer the mixture to a bowl and garnish with thinly sliced green onions and toasted sesame seeds before serving.