Boil a large pot of salted water. Add Chinese noodles or spaghetti and cook until al dente. Drain and set aside.
Heat 1 tsp sesame oil in a skillet over medium heat. Add ground beef and cook for 5–7 minutes until browned and crumbly. Drain excess grease if needed.
In a bowl, mix soy sauce, rice vinegar, chili oil, sugar, garlic, ginger, chicken broth, and tahini until smooth and creamy.
Add garlic, ginger, and white parts of green onions to the cooked beef. Stir for 1 minute, then pour in the sauce. Simmer for 3–4 minutes until thickened.
Add the cooked noodles to the skillet. Use tongs to toss until evenly coated in sauce.
Spoon into bowls. Drizzle with chili oil, sprinkle with green onions, and top with crushed peanuts or extra sesame paste.