Add the vegetable broth and water. Bring to a boil, reduce heat to a low simmer, add the Sambal Oelek (if using), and the noodles, cook for 2 minutes, then add the cabbage. Cook for 3 more minutes until the noodles and cabbage are tender.
NOTE: The instant noodles I used took a total of 5 minutes to cook, so check the package beforehand in case cooking time should be adjusted.