Vegetable Lo Mein

Name: Vegetable Lo Mein
Ingredients: 1 medium onion, halved from pole to pole, each half cut into eight wedges; 4 ounces shredded cabbage; 4 ounces sliced mushrooms; 1 1⁄2 teaspoons garlic; 1 1⁄2 teaspoons minced fresh ginger; 1 tablespoon soy sauce; 2 tablespoons vegetable oil, divided; 4 cups of leftover cooked spaghetti (about 8 oz uncooked); Lo Mein Flavoring Sauce; 1⁄4 cup chicken broth; 1⁄4 cup soy sauce; 2 teaspoons rice wine vinegar; 2 teaspoons toasted sesame oil; 1 dash hot red pepper flakes; 1 teaspoon sugar