1. Combine first 5 ingredients in a small bowl.
2. Heat a wok or skillet over high heat. Add oil to pan; swirl to coat. Add half of beef to pan, and cook for 3 minutes or until browned. Remove beef from pan. Repeat procedure with remaining beef. Add onions; cook for 1 minute. Add soy sauce mixture; cook 1 minute. Return beef to pan; cook 1 minute. Stir in spinach, and cook 30 seconds. Top with sesame seeds.
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