This recipe came from a former neighbor. Thanks, Lois! It can be served as either a main dish or a side dish and is different from most acorn squash recipes because it isn't sweet. It smells absolutely wonderful while it's baking. I usually make it using just one squash, then serve the leftover onion, pepper and celery mixture over baked potatoes at another meal. And just for the record, I have no idea why this recipe is called "Spanish".