1. Place noodles in a large bowl; pour boiling water over noodles to cover. Let stand 6 minutes or until pliable, stirring occasionally to separate noodles. Drain. Combine stock, oyster sauce, soy sauce, sugar, and red pepper in a small bowl; whisk until sugar dissolves.
2. Heat a large nonstick skillet or wok over medium-high heat. Add beef to pan; cook 4 minutes or until beef is browned and crispy in places, stirring to crumble. Remove from pan.
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