Portabello Marinara Sauce

My Portabello Marinara Sauce is very simple I saute 1 small finely chopped onion until soft then I add 3 medium or 2 large diced portabellos to the onions and continue sauteing until the mushrooms are soft. Then add 3 cups of my homemade spaghetti sauce or a jar of Marinara (we use Newman's Own). Heat the whole thing through. Serve on pasta of choice.