Portabello mushroom sauce with chunky red skin mashed potatoes and a green bean & carrot medley. No preservatives. Inspected and passed U.S. Department of Agriculture. At Stouffer's, great taste begins with the highest quality ingredients. It's good to know: A tasty fact, the right side dish completes a meal. That's why we pair our slow roasted beef with chunky red skin mashed potatoes. Did you know, Stouffer's has over 90 delicious varieties with no preservatives, 0 g trans fat. Vegetable serving = 3.