Canning Green Tomato Relish

Here is the recipe I have for Green Tomato Relish:
1 gal. green tomatoes, chopped
1/2 cup salt
2 medium onions
1/2 medium sized cabbage head
4 large green peppers
2 large sweet red peppers
3 cups vinegar
2 tsp. celery seed
2 tsp. mustard seed
1 tsp. whole cloves (tie in a muslin bag)

Mix tomatoes with salt, let stand overnight; drain. Put onions, cabbage, green & red peppers through food chopper, using a coarse knife. Place tomatoes & chopped vegetables in large kettle. Add vinegar, celery seed, mustard seed & cloves. Cook until mixture is tender & quite thick, about 35 minutes. Remove cloves. Pour at once into sterilized jars and seal.