Wash and grate the cucumber, then transfer it to a sieve and press down to remove any excess water.
Peel and crush the garlic cloves.
In a large bowl, combine the natural Greek yoghurt, drained cucumber, garlic, extra virgin olive oil, white wine vinegar or juice of half a lemon and chopped dill.
Season with fine salt and freshly ground black pepper to taste, then stir until well combined.
Cover with cling film and chill in the fridge for at least 30 minutes before serving.