Authentic Greek taverna tzatziki: thick strained Greek sheep's yoghurt, grated cucumber squeezed bone-dry, minced garlic, extra virgin olive oil, red wine vinegar, and fresh dill.
Coarsely grate cucumber into a kitchen towel. Sprinkle with salt, let stand 5 minutes, then twist and squeeze towel with all your strength until not a single drop of liquid remains.
In a bowl, combine strained Greek yoghurt, bone-dry cucumber, grated garlic, olive oil, and red wine vinegar.
Stir in finely chopped fresh dill and season with fine sea salt. Mix thoroughly until rich, thick, and velvety.
Chill for at least 1 hour before serving. Garnish with a swirl of olive oil and a whole Kalamata olive.