This really good if made with Vidallia onions

3-4 sweet onions chopped fine
2 cups water
1/2 cup cider vinegar
1/2 cup sugar
1/2 cup mayo
celery seed(to taste)

Mix water,vinegar and sugar in bowl. Add onions and marinate in refrig 2-4 hours. Drain well and pat dry with paper towels. Add mayp and celery seed.

Serve with crackers or toasted thinly sliced baquette.