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 oil in a saucepan over low heat. 2  Add tomato sauce, sofrito, sazon, and pepper. 3  Cook, stirring for about 3 minutes. 4  Stir in beans, water, and salt. 5  Increase heat to medium, and cook for 15 minutes, or until sauce has thickened. Add tomato sauce, sofrito, sazon, and pepper. 2  Cook, stirring for about 3 minutes. 3  Stir in beans, water, and salt. 4  Increase heat to medium, and cook for 15 minutes, or until sauce has thickened.