In a large kettle, brown 1 - 1/2 lb stew meat, cubed roast or ground beef. Add 5 cups water, 4 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 30 minutes. Optional: Add one can (13 oz.) drained mushrooms and 1/2 cup sour cream. Not recommended for crock pot, stovetop only