In large bowl, microwave first 4 ingredients with 2 tbsp. water 30 seconds; whisk to dissolve sugar. Toss in next 4 ingredients. In skillet, cook seasoned steak over medium-high, about 3 minutes per side for medium-rare; let rest 10 minutes. Slice thinly against the grain. Fan steak over noodles and sprinkle with peanuts.