Blanch the broccoli first, not last. While the noodles cook, bring a separate small pot of water to a boil (or use the same pot after draining noodles) and blanch the broccoli for 90 seconds, just until it turns bright green. Drain and set aside. This is the step most versions of this recipe skip, and it’s the reason the broccoli usually ends up either underdone or gray and waterlogged by the time everything else in the pan is ready a raw floret needs far longer to cook through than a browned crumble of beef does. Giving it a head start means it finishes in the sauce at exactly the same moment the beef does, instead of overcooking while you wait on the meat.

Brown the beef. Heat 1 tablespoon of oil in your skillet or wok over medium-high heat. Add the ground beef, breaking it up with a spatula, and cook until browned and mostly cooked through, about 5–6 minutes. Drain excess fat if there’s a lot.

Bloom the aromatics. Push the beef to one side of the pan (or remove it briefly if your pan is small) and add the remaining oil, garlic, and ginger. Cook for about 30 seconds until fragrant don’t walk away here, since garlic can go from golden to bitter in under a minute.

Build the sauce. Stir the soy sauce, oyster sauce, and brown sugar into the pan with the beef and garlic. Give the cornstarch slurry a quick re-stir (it settles fast) and pour it in. Simmer for about 1 minute, stirring, until the sauce visibly thickens and coats the back of a spoon.

Bring it all together. Add the blanched broccoli and cooked noodles to the pan. Toss everything together until the noodles are glossy and evenly coated — tongs make this easier than a spatula. Drizzle in the sesame oil and give it one final toss off the heat, since sesame oil loses its aroma if it cooks too long.

Serve. Top with sliced green onions and sesame seeds if using. Serve immediately, while the noodles are still glossy and hot.