To make this dish, start by preparing the beef. Heat a large skillet, on the stove, over medium-high heat. Once the skillet is hot, add in the beef.
Sauté the ground beef until it's browned and no longer pink.
Then, add in the mashed garlic and sauté them together for another minute.
Next, add in the soy sauce, coconut sugar, beef broth, hoisin sauce, ground ginger, ground black pepper, and crushed red pepper flakes. Stir them well to combine.
Next, prepare a slurry. Add the arrowroot starch or cornstarch to a bowl, alongside the water, and whisk to combine.
Add the slurry to the skillet with the beef, and bring it to a gentle simmer until the sauce begins to thicken.
Once the sauce has thickened to your liking, remove the skillet from the heat and set it aside.
Next, prepare the noodles. Cook the glass noodles according to the package instructions, being sure to stir them frequently so that they don't clump together.
Drain and rinse the noodles under cold water after they finish cooking.
Finally, add the noodles to the skillet with the beef and toss until they're fully incorporated. Garnish with sliced green onions and sesame seeds, if desired, then serve and enjoy!