Dice the pork loin into small 1/2-inch cubes and season with sea salt and black pepper.
Heat a large non-stick skillet over medium-high heat and add the sesame oil.
Add the pork to the skillet and sear until browned and crispy on all sides, about 5 to 6 minutes.
Stir in the minced garlic and grated ginger, cooking for 30 seconds until fragrant.
Add the chopped kimchi and cooked brown rice to the pan, pressing down firmly with a spatula to flatten the mixture.
Let the rice sit undisturbed for 3 minutes to develop a crispy golden crust on the bottom.
Toss the rice and kimchi together, then push everything to one side of the pan.
Crack the egg into the empty space, scramble it quickly until set, and then fold it into the rice mixture.
Drizzle with tamari and stir in the sliced green onions before serving immediately.