Apple Ketchup

From The Joy of Pickling by Linda Ziedrich.
Ingredients:
1 quart applesauce
3/4 lb. onions, minced
1 c. firmly packed light brown sugar
2 c. cider vinegar
1 tsp. ground black pepper
1 tsp. grated fresh ginger
1 tsp. dry mustard
2 tsp. ground cinnamon
1 Tbsp. pickling salt

Combine all of the ingredients in a nonreactive pot. Simmer them, stirring occasionally, for 30 minutes, or until the ketchup is as thick as you like.
Ladle the ketchup into pint or half pint mason jars, leaving 1/4 inch headspace, and close the jars with two piece caps. Process the jars for 15 minutes in a boiling water bath.
Store the cooled jars in a cool, dry, dark place.
Makes about 3 pints.