Grate the cucumber and add some salt.
Put the cucumber in a fine strainer, even better with some clean cloth on it, and leave it aside to lose as much liquid as possible.
Add a pinch of salt and a bit of vinegar.
Put the yogurt in an ample bowl to better combine the ingredients, add the minced garlic, the lemon juice or vinegar, and the olive oil.
Mix well until everything is combined.
Go back to your cucumber, squeeze it, get rid of the liquid, and add it to the yogurt mix.
Add salt and pepper to season and some finely chopped dill, parsley, or even mint (optional).
Keep it in the fridge until it's time to serve.
Decorate with Kalamata olives or more dill.