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.
How to Make It. 1  Peel shrimp; devein, if desired. 2  Melt butter in a large skillet over medium heat; gradually whisk in flour, and cook, whisking constantly, until flour is a light caramel color (about 6 minutes). 3  Add onion, bell pepper, and celery, and cook 8 to 10 minutes or until tender.