In a small bowl, mix the satay sauce and peanut butter together. Set aside.
In a medium bowl, combine sugar, soy sauce, sesame oil, water and white pepper. Set aside.
Bring a medium pot of water to a boil.
Meanwhile, in a large nonstick skillet over medium-high heat, add 1 tablespoon vegetable oil. Add beef and saute until very little pink. Transfer the beef (with juice) to a medium bowl. Wipe the skillet clean with paper towels.
Add the noodles into the pot of boiling water. Cook for 2 – 3 minutes for thin noodles or 7 - 8 minutes for thick noodles, stirring often to separate the noodles. Drain and rinse under running water for 10 seconds. Cut them roughly into 3 parts with a pair of scissors. Divide the noodles into 2 serving bowls.
In the same large skillet over medium-high heat, add ½ tablespoon oil. Add garlic and cook for 1 minute. Add the satay and peanut butter mixture. Stir and cook for 1 minute. Pour in the soy sauce mixture. Bring to a boil and cook for 2 minutes. Put the beef back and cook for 2 more minutes. Transfer the beef and sauce to the serving bowls over the noodles. Serve immediately.