In a large skillet over medium to medium-high heat, brown the ground beef. Break it up into smaller pieces with a spatula as it cooks. When the beef is about halfway browned, stir in garlic and ginger, and continue to cook until beef is no longer pink. Drain off any fat.
In a small bowl, combine soy sauce, brown sugar, sesame oil, chili garlic sauce, and black pepper. Pour over browned beef and fold to combine. Simmer for a minute or two, until thoroughly warmed.
Serve over hot rice or tucked into lettuce wraps. Sprinkle with scallions and sesame seeds. Offer fresh cilantro and pickled red onions on the side.
