Slice the pork tenderloin into very thin, bite-sized strips to mimic the texture of pork belly.
In a small bowl, whisk together the gochujang, tamari, minced ginger, and minced garlic to create the marinade.
Toss the pork strips in half of the marinade and season with sea salt and black pepper.
Heat the sesame oil in a large skillet over medium-high heat until shimmering.
Add the pork to the skillet in a single layer and sear for 3-4 minutes until the edges are crispy and caramelized.
While the pork cooks, steam or sauté the cauliflower rice in a separate pan until tender, about 5 minutes.
Add the remaining marinade to the pork and toss for 1 minute to glaze the meat thoroughly.
Assemble the bowls by placing a base of cauliflower rice at the bottom.
Top with the spicy pork, a scoop of tangy kimchi, and fresh sliced cucumbers.
Garnish with toasted sesame seeds and thinly sliced green onions before serving.