In a mixing bowl, combine soy sauce, sesame oil, brown sugar, minced garlic, grated ginger, and black pepper. Mix well.

Add ground beef to the marinade and mix until well coated. Let it marinate for at least 10 minutes.

Heat a large skillet over medium-high heat. Add the marinated ground beef and cook until browned, about 5-7 minutes, breaking it apart with a spatula.

In the same skillet, add sliced carrots and bell pepper to the cooked beef. Stir-fry for an additional 5 minutes until vegetables are tender.

In serving bowls, layer cooked brown rice, followed by the beef and vegetable mixture. Top with steamed broccoli.

Garnish with sliced green onions and sesame seeds before serving.