Dice the pork tenderloin and pork belly into small, uniform half-inch cubes.
In a small bowl, whisk together the gochujang, coconut aminos, honey, minced garlic, and grated ginger to create the glaze.
In a separate bowl, toss the shredded cabbage with rice vinegar and a pinch of sea salt to create a quick, bright slaw.
Heat a cast-iron skillet over medium-high heat with the sesame oil; add the pork belly first to render the fat until crispy.
Add the pork tenderloin to the skillet, seasoning with the remaining sea salt and black pepper, and sauté until browned and cooked through.
Pour the gochujang glaze over the pork and toss for 1 minute until the sauce is thick, sticky, and coats every piece.
Briefly warm the corn tortillas in a dry pan or over an open flame until pliable and slightly charred.
Assemble the tacos by dividing the spicy pork between the tortillas and topping with a generous portion of the zesty slaw.