In a small bowl, whisk together the gochujang, coconut aminos, rice vinegar, sesame oil, minced garlic, and grated ginger to create the marinade.
Slice the pork loin into very thin strips and dice the pork belly into small pieces, seasoning both lightly with sea salt and black pepper.
Heat a large skillet over medium-high heat; add the pork belly first, cooking for 3-4 minutes until the fat renders and the edges become crispy.
Add the pork loin strips to the skillet and sauté for 4-5 minutes until cooked through and slightly browned.
Pour the gochujang sauce over the meat and toss continuously for 1-2 minutes until the sauce thickens into a glossy, sticky glaze.
Briefly toast the corn tortillas over an open flame or in a dry pan until warm and pliable.
Divide the glazed pork between the tortillas and top with chopped kimchi, julienned cucumber, and sliced green onions.