Cook the beef: In a large, wide skillet over medium heat, cook ground beef until browned, breaking it up as it cooks. Drain excess grease if needed.
1 lb ground beef
Build the flavor base: Add scallion whites and garlic to the pan. Cook for 1–2 minutes Start Timer, until fragrant. Drizzle in the neutral oil and let everything sizzle together.
1 bunch scallions, 3 cloves garlic, 2-3 Tbsp. neutral oil
Add liquid + sauce: Whisk together sauce ingredients and pour into the pan, and bring to a simmer.
1/4 cup soy sauce, 2 Tbsp. rice vinegar, 1 Tbsp. brown sugar, 1 Tbsp. sesame oil, 1-2 tsp. hoisin, 1 tsp. fish sauce
Cook the noodles: Add dry ramen noodles directly into the center of the pan and add beef broth. Cover and cook for a few minutes, gently breaking them apart and stirring occasionally until the noodles are tender and the sauce has reduced some. Add a splash more broth if needed.
10 oz ramen noodles, 1½-2 cups beef broth
Thicken the sauce (cornstarch slurry): In a small bowl, whisk together the cornstarch and water until smooth. Pour the slurry into the pan and stir well. Let simmer for 1-2 minutes Start Timer, until the sauce thickens and becomes glossy, coating the noodles. If needed, add a little more slurry to reach your desired consistency. Taste and adjust seasoning. (You can also stir in fresh baby spinach or bok choy here at the end and stir until wilted, if desired.)
1 Tbsp. cornstarch + 1 Tbsp. water
Finish + serve: Top with chili crisp and lime juice. Garnish with scallion greens and dig in.
1-2 Tbsp chili crisp, Squeeze of lime