Keep 2 airtight containers in freezer. Add leftovers as you have them (vegetables, rice, plain pasta, are perfect). When you have enough, peel and dice 2 large potatoes. Dice 1/2 onion, peel and slice 1 or 2 carrots. Combine potatoes, onion, and carrots in about 1 1/2 inches of water in a heavy pot. Boil until tender, about 20 minutes. Next add leftovers, salt to taste, and 1 1/2 quarts tomato juice and simmer until vegetables are separated and heated through.