Hi! Here is another one, similar, yet different. You could try each for a batch and see which you like best. Both from same book.
ZUCCHINI RELISH #2
10 cups ground zucchini (seeded first)
2 cups ground onion
5 tsp. salt
2 1/4 cups vinegar
4 cups sugar
1 tsp. dry mustard
2 tsp. celery seed
1 Tbsp. nutmeg
2 tsp. tumeric
2 Tbsp. cornstarch

Mix onion and zucchini; sprinkle with salt. Let stand overnight. Drain and rinse well. Add remaining ingredients and bring to a rolling boil. Cook for 5 minutes. Makes approx. 4 quarts. Seal in hot sterilized jars.