Trim excess fat from the steak and slice into very thin slices.
Preheat a pan or wok on stovetop and heat really well over high heat, then add oil. When the oil is smoking, and not until, add beef and stir fry for a couple minutes until beef changes color and is cooked through. Remove and set aside
With the pan back on the heat and smoking again, add a teaspoon of oil and the tomatoes. Stir-fry about a minute.
Add the beef, noodles and black bean sauce to the tomatoes. Stir the whole business until the flavor is through everything and all is heated.