1 medium cucumber peeled and diced
1 large ripe tomato peeled and diced
1 large green tomato, diced
1 large onion, diced
1 cup apple cider vinegar
1 cup granulated sugar
1 tsp celery seeds
1 tsp mustard seeds
1 tsp salt
1 tsp mixed pickling spice (tied in a cloth)

Mix all in sauce pan. Bring to a boil, then simmer for 50 minutes; stirring often. Remove spice bag. Seal in sterilized jars.