Begin by slicing your 1 pound of tender beef as thin as possible. The thinner the slices, the more tender and flavorful the bulgogi will be. If your beef is slightly frozen, it’s easier to slice thinly. Set the beef aside in a mixing bowl.
In the same bowl as your beef, add ½ cup soy sauce, 3 tablespoons sugar, 1 tablespoon sesame oil, 3 cloves of crushed or minced garlic, 2 teaspoons salt, and ½ teaspoon pepper. Mix everything thoroughly to ensure the sugar dissolves and the beef is well coated. Add ½ cup chopped green onions and 1 tablespoon sesame seeds, stirring gently to combine. Let the beef marinate for at least 20 minutes. For deeper flavor, marinate up to 2 hours in the fridge.
Heat a large skillet or grill pan over medium-high heat. Once hot, add the marinated beef in a single layer, cooking in batches if necessary. Sear the beef slices quickly—about 2 to 3 minutes per side—until cooked through and caramelized. Avoid overcrowding the pan to ensure proper browning.
While the beef cooks, slice your cucumber thinly and shred the carrots. If you haven’t already, cook 2 cups of rice or your preferred grain according to package instructions. Fluff the rice once it’s done.
Divide the cooked rice between your serving bowls. Arrange the cooked bulgogi beef on top, then add the sliced cucumber and shredded carrots around the sides. Garnish with additional sliced green onion and a sprinkle of toasted sesame seeds. Serve immediately for the best texture and flavor.