How to Make It
Cut the ends off the cucumbers, then, using a mandoline or sharp knife, slice the cucumber crosswise into thin slices. Add the cucumber to a large sieve and toss with 1 teaspoon salt. In a small bowl, add the onions and cover with cold water. Soak the onions for 30 minutes.
Meanwhile, in a large bowl, mix together the sour cream, vinegar and sugar. Rinse the cucumbers well and drain. Drain the onions. Add the drained cucumbers, onion and dill to the bowl with the dressing and mix. Serve.