Scallion Beef Stir-Fry (蔥爆牛肉) Marinade: 8 oz sirloin beef, thinly sliced 1 Tbsp Soy Sauce 1 tsp sugar 1/2 tsp white pepper powder 1 Tbsp cornstarch, mixed with 1 Tbsp water 1 Tbsp oil Stir-Fry: * Marinated beef 2 cups scallions, sliced into strips 2 cups yellow onions, sliced into strips 1 cup red onions, sliced into strips 1 cup jalapeño pepper, sliced into strips 1 Tbsp minced garlic 2 Tbsp oil (divided) 1 tsp black pepper 1 tsp sesame oil 1 Tbsp soy sauce 1 tsp sugar Instr ...