Noodles: Cook the linguini according to package instructions. Drain well and set aside.
Brown: In a large skillet over medium-high heat, sauté the ground beef until it is completely browned and no longer pink. Drain off any excess grease if desired.
Aromatics: Stir in the ginger paste and minced garlic. Sauté for about 60 seconds until you can smell the aroma.
The Glaze: Pour in the beef broth, soy sauce, hoisin sauce, and brown sugar. Add the black pepper and red pepper flakes.
Simmer: Reduce the heat to low and simmer for 10–15 minutes. This is the most important step—the sauce needs time to reduce and thicken into a syrupy consistency.
Toss: Add the cooked linguini directly into the skillet. Use tongs to toss the noodles until they are fully coated in the dark, glossy sauce.
Serve: Plate immediately and top with sliced green onions and a sprinkle of sesame seeds for a fresh crunch.