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.
1 Stir in onion; cook for 5 minutes, until onions are translucent and begin to brown. 2  Add garlic, stir for about a minute. 3  Stir in 1 1/2 tablespoons flour; cook and stir for about 1 minute.4  Add tomato paste, and cook for another minute.5  Slowly add chicken stock, stir to combine, and return to a simmer. Stir in onion; cook for 5 minutes, until onions are translucent and begin to brown. 2  Add garlic, stir for about a minute. 3  Stir in 1 1/2 tablespoons flour; cook and stir for about 1 minute.