Peel, seed and slice cucumbers.
Cut onions to thin slices and mix with cucumbers.
In a separate bowl mix together sour cream (or Mayo) with the Sugar, Dill, salt and pepper.
Fold the sour cream mixture in the cucumbers and onions.
Serve immediately or refrigerate for up to an hour.
Chef's notes: Cucumbers release water so you don't want to make this too much ahead of time or it will be watery.