1. Thinly slice the Beef sirloin against the grain into bite-sized pieces. If the beef is partially frozen, it will be easier to slice.
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2. Prepare the marinade: In a large mixing bowl, combine the Soy sauce, White sugar, Sesame oil, minced Garlic, minced Ginger, and Ground black pepper.
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3. Grate the Asian pear and add it to the marinade. Finely chop half of the Yellow onion and half of the Green onion, then incorporate them into the marinade mixture.