– 1 cup of vegetable oil – 1 ½ pounds flank steak – ½ cup cornstarch – 1 tablespoon vegetable oil – 2 teaspoon fresh ginger, minced – 1 tablespoon garlic, minced – ½ cup of soy sauce – ½ cup of water – ½ cup brown sugar, packed – 2 tablespoon hoisin sauce – 1 teaspoon sriracha – ¼ teaspoon plus 1/8 tsp red pepper flakes – 1 teaspoon sesame oil – 4 to 5 green onions