Peel the cucumber and cut it into very fine slices, as paper-like as possible. Put it in a colander and sprinkle with the salt. Leave over a bowl to drip for 1 hour.
Squeeze the cucumber over the sink to get rid of the excess water and combine with the yoghurt in a serving dish. Peel and finely chop the garlic and onion and add these. Coarsely chop the dill and sprinkle over. Add a smal