Cut beef into slices 1/4 inch thick. Place wok over high heat for about 1 minute. Pour in peanut oil, let heat, and add half the beef strips, stir-frying for about 5 seconds. Remove and repeat with remaining strips. Set strips aside.
Mix remaining ingredients, except for snow peas, add to wok, and stir-fry a few seconds. Add snow peas and stir-fry for 1 minute. Remove from heat, add beef, and turn mixture onto serving platter.