In a 12-inch skillet, brown ground beef and 1 tablespoon of sesame oil until meat is no longer pink and is cooked through.
Add garlic paste to the skillet and brown for an additional minute.
Add ginger paste, soy sauce, brown sugar, red pepper flakes, 2 tablespoons of sliced green onions, and the remaining 1 teaspoon of sesame oil to the skillet. Saute until sauce is bubbly and meat is evenly seasoned with the sauce.
Garnish with additional green onions and sesame seeds, if desired.