Spaghetti Sauce
["3 cans Contadina tomato paste", "medium onion, sliced", "salt", "9 cans water", "heaping Tbsp. butter", "mushrooms (optional)", "cooked ground beef"]
["Cook first 5 ingredients 3 1/2 hours.", "Add mushrooms halfway through and cooked ground beef."]
["tomato paste", "onion", "salt", "water", "butter", "mushrooms", "ground beef"]