Chilled Cucumber Slices

Place sliced cucumbers into a shallow bowl. Sprinkle with salt and toss gently; set aside for 1 hour. Meanwhile, combine sugar and vinegar in saucepan. Bring to a full boil. Remove from heat and cool. Drain cucumbers; add sliced onions and cover with cool vinegar-sugar mixture. Chill at least 4 hours or overnight before serving.