30min · 4 servings 2 teaspoons olive oil 1/2 teaspoon ginger minced 1 tablespoon garlic chopped 1/2 cup soy sauce 1/2 cup water 3/4 cup dark brown sugar 1 cup vegetable oil for frying 1.5 lb flank steak 1/3 cup cornstarch green onion diagonally sliced