Peel onions, slice and pull apart. Boil vinegar, water, sugar, and salt slightly. Pour over onions while boiling hot. Cover and leave in refrigerator overnight. Drain well in the morning. Add mayonnaise and celery seed and mix well. Cool before serving.
By Sandy from Graettinger, IA
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Soak onion rings 2-4 hours or overnight in water to which ice cubes, vinegar, sugar and salt have been added. Cover container well and refrigerate. Drain well on paper towels; place in bowl.