asian soup recipe

Ingredients: 1 tablespoon vegetable oil 1 onion, chopped 3 cloves garlic, minced 1-inch piece of fresh ginger, grated 8 cups chicken broth 2 tablespoons soy sauce 1 tablespoon fish sauce (optional) 1 tablespoon rice vinegar 2 cups cooked chicken, shredded 1 cup carrots, julienned