Phosphonate salts are the result of deprotonation of phosphonic acids, which are diprotic acids: Phosphonate esters are the result of condensation of phosphonic acids with alcohols. Several methods exist for the preparation of phosphonic acids and their salts.
1 Stir in the tomato sauce, tomato paste, vinegar, diced tomatoes, and brown sugar. Season with chili powder, Italian seasoning, and salt. Bring to a boil, reduce heat to low, and simmer 1 hour.  Mix the cornstarch and water, and stir into the salsa to thicken. Transfer salsa to sterilized jars, leaving 1/2 inch headroom, and seal. Process jars in a boiling water bath 15 minutes. Store unsealed jars in the refrigerator.
Ingredients (16) For the salsa: 1/3 cup cooked black beans. 1/3 cup fresh corn kernels (from about 1/2 ear of corn) 1/3 cup small-dice tomatoes (from about 1/2 medium tomato) 1/3 cup small-dice zucchini or summer squash (from about 1/2 medium squash) 2 tablespoons finely chopped red onion (from about 1/4 medium onion)