In a large kettle, brown 1 - 1/4# stew meat, cubed roast or ground beef. Add 4 1/4 cups water, 3 1/3 cups milk and 2 tablespoons margarine. Heat slowly over low temperature until margarine melts. While stirring, slowly add entire amount of soup mix. Reduce heat and simmer, uncovered, for approx. 30 minutes. Optional: add one can (13 oz.) drained mushrooms and 1/2 cup sour cream. More water or broth may be added for desired consistency. Not recommended for crockpot; stove-top only.