Place a sieve over a bowl and layer the cucumber slices in it, sprinkling salt between each layer. Leave for 45 minutes to release its juice through the sieve, stirring occasionally.
Arrange the cucumber slices on a serving platter or in a bowl.
Mix the water, vinegar, and sugar together and pour over the cucumbers. Cover and refrigerate for one hour to allow the pickling solution to infuse.
Garnish with black pepper, scatter over the chopped dill, and serve.
Notes
Don't skip salting the cucumbers or your salad will be very watery indeed. You could swap the dill for fresh mint if you prefer. This salad tastes delicious alongside smoked fish, BBQ meats, or tangy cheeses like feta.