Peel and slice cucumbers as for salad in a 12 ounce Cool Whip container. Add one medium onion, sliced. Fill 2/3 full.

Mix in separate bowl:

3/4 c. Miracle Whip
1/4 c. sugar
2 tbsp. vinegar

Pour over cucumbers and mix. Set in refrigerator for two hours. You can use then or it will keep in refrigerator for a week.