Slice or cut in rounds as thin as possible cukes & onions.
Place in bowl and cover with vinegar.
Add 3-5 heaping tablespoons of sugar, Mix well.
Chill and serve.
This is better if you let it sit in the fridge covered overnight. Actually. if allowed to mellow for 2 or 3 days -- in a tightly sealed jar in the refrigerator -- JAR TURNED UPSIDE DOWN 1 day & turned right side up the next.