1 1/4 lbs zucchini, 4 cups finely chopped
2 medium onions, finely chopped
1 sweet red pepper, finely chopped
2 tablespoons pickling salt
1 1/4 cups granulated sugar
3/4 cup cider vinegar
1 teaspoon dry mustard
1 teaspoon celery seed (not celery salt)
1/2 teaspoon hot pepper flakes
1/2 teaspoon turmeric
1 tablespoon water
2 teaspoons cornstarch