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 Heat the oil in a medium saucepan over medium heat, and cook the onion until tender. 2  Mix in cocoa powder, cumin, cilantro, and garlic. 3  Stir in the tomato soup and green chile peppers. 4  Bring to a boil, reduce heat to low, cover, and simmer 10 minutes. 5  Transfer to a gravy boat or pour directly over food to serve.