Cook linguine according to package instructions, drain, and set aside.
In a skillet, brown ground beef over medium-high heat. Drain excess fat.
Add minced garlic to beef; cook until fragrant.
Stir in brown sugar, beef broth, soy sauce, hoisin sauce, ginger, black pepper, and red pepper flakes.
Dissolve cornstarch in water; add to beef mixture. Bring to a gentle boil until sauce thickens.
Combine noodles with beef mixture, ensuring noodles are well coated.
Garnish with green onions before serving.
