Slice the lean pork loin into very thin, bite-sized strips to mimic the texture of traditional pork belly.
In a small mixing bowl, whisk together the gochujang paste, tamari, rice vinegar, minced garlic, and grated ginger until smooth.
Heat the toasted sesame oil in a large non-stick skillet over medium-high heat.
Add the pork strips to the skillet in a single layer and sear for 3-4 minutes until golden brown and crispy on the edges.
Pour the gochujang sauce mixture over the pork and toss continuously for 1-2 minutes until the sauce reduces into a thick, sticky glaze.
In a separate pan, steam or lightly sauté the cauliflower rice with a pinch of sea salt for 3 minutes until just tender.
Divide the cauliflower rice into a bowl and top with the glazed pork strips.
Add the sliced cucumber and kimchi to the bowl for crunch and acidity.
Garnish the entire dish with sesame seeds and serve immediately.