In a mixing bowl, combine soy sauce, brown sugar, sesame oil, garlic, ginger, gochujang, and green onion. Add the sliced beef and mix well. Marinate for at least 30 minutes.

Heat a grill or pan over medium-high heat. Cook the marinated beef for about 5-7 minutes until browned and cooked through.

In serving bowls, layer cooked rice, followed by cooked beef, carrots, bell pepper, and spinach.

Sprinkle sesame seeds on top for garnish.