Heat the sesame oil in a large skillet over medium-high heat. Once it’s hot, add the ground beef and break it up with a spoon as it cooks. Let it brown for about 5–6 minutes, stirring occasionally.You’re looking for fully cooked beef with a little bit of caramelization that’s where the flavor starts building. Stir in the minced garlic, diced onion, and ginger. Cook for another 2–3 minutes, just until the onions soften and everything smells amazing.This step makes a big difference. Taking a couple extra minutes here adds depth and richness to the whole dish. Add the soy sauce, gochujang, brown sugar (or honey), and rice vinegar. Stir well so every bit of beef gets coated in that glossy, flavorful sauce.
Let it cook for another 3–5 minutes, allowing everything to come together. Remove from heat and sprinkle sesame seeds over the top.
Lay out the lettuce leaves on a large platter. Start with a spoonful of chopped kimchi in each leaf, followed by the seasoned beef. Add cucumber, carrot, and green onions.
Finish with an extra dollop of gochujang or ssamjang if you like things a little spicy.
Sprinkle with more sesame seeds if you want, then serve immediately. Fold the lettuce like a taco and enjoy every bite.