This recipe is adapted from recipes that came with my Nesco dehydrator and uses their "Fruit Roll Sheets". You could substitute parchment paper sprayed with a vegetable spray, like Pam. Cooking time includes dehydrator drying time.
Chop or grind all ingredients together, then blend in portions until smooth. Press through a strainer to remove any pulp.
In a very large kettle (12 quart or larger) bring mixture to a boil over medium heat. Boil gently, uncovered for about 5 hours. Stir often to prevent scorching.
Mixture should be thick enough to mound on a spoon.
Ladle onto 5 "Fruit Roll" sheets and dry at 140º until crisp, 8 to 10 hours. Powder in a blender.
Add different amounts of water to your powder mixture to make:.
Tomato Paste - 1 teaspoon powder and 1 teaspoon water.
Tomato Sauce - 1 teaspoon powder and 3 teaspoons water.
Tomato Soup - 1 teaspoon powder and 2 teaspoons cream.
Tomato Juice - 1 teaspoon powder and 1/2 cup water or more.
Adjust amount of water to taste for soup and juice.