Wash zucchini and cut in thin slices Peel and cut onions in quarters then slice very thin Add to zucchini Sprinkle salt over vegetables add cold water enough to cover Let stand for 2 hours Bring all ingredients to boiling point and heat for 5 minutes Pack hot into hot jars remove air bubbles Adjust caps Process for 15 minutes in a boiling watter bath Makes about 4 half pints