Slice steak, across the grain, into inch thick strips see picture tutorial HERE , and place in a large plastic bag. Add mirin and soy sauce and massage into the meat. Let meat marinate for about minutes or so. In a medium mixing bowl, whisk together sauce ingre.nts and set aside..Ingre.nts. lbs flank steak thinly sliced. cup teaspoons cornstarch divided use. tablespoons vegetable oil. teaspoons minced garlic. teaspoon minced ginger. teaspoon toasted sesame oil. cup low sodium soy sauce. cup water..Whether you re looking to make Mongolian beef or classic beef and broccoli, find dozens of tempting Chinese beef main dish recipes to make at home. Mongolian Beef and Spring Onions. See how to prepare this easy beef stir fry..You ll be eating these Asian beef recipes on repeat..