Slice the pork tenderloin into 1-inch cubes and pat dry with a paper towel to ensure a proper sear.
In a small bowl, whisk together the gochujang, coconut aminos, rice vinegar, minced garlic, and grated ginger until smooth.
Heat a large cast-iron skillet over medium-high heat with the toasted sesame oil until shimmering.
Add the pork cubes in a single layer, leaving space between them, and sear for 3-4 minutes until a deep golden-brown crust forms.
Pour the gochujang sauce over the pork and toss quickly to coat, simmering for 1-2 minutes until the sauce becomes a sticky, vibrant glaze.
In a separate skillet, lightly sauté the cauliflower rice for 3-5 minutes until tender and moisture has evaporated.
Assemble the bowls by layering the cauliflower rice, glazed pork, sliced cucumber, and tangy kimchi.
Finish with a sprinkle of sesame seeds and thinly sliced green onions for a fresh crunch.