In a bowl mix the chopped dill, olive oil, lemon juice, sea salt, garlic, and yogurt. Put in the refrigerator until you need it.
Halve the cucumber. Scrape with a teaspoon the seeds from the cucumber.
Cut the cucumber into small slices.
Take the marinated yogurt from the refrigerator and mix the cucumber through. You get the best tzatziki if you leave it in the refrigerator to marinate for at least 2 hours
Serve garnished with a sprig of dill on top.
Because your dressing contains sufficient moisture you don't want to add any more through the cucumbers. Therefore you scrape out the seeds with the back of a spoon. Otherwise, the Tzatziki will become watery.
If you want nice creamy tzatziki you use Greek yogurt. Would you prefer more skinny tzatziki, but with the creamy touch, then buy a low-fat yogurt, and thicken it. How do you thicken the yogurt? Place a sieve over a bowl. Place cheesecloth in the sieve and pour the yogurt in it. Let it drain overnight.
If you don't have fresh dill, you replace it with one teaspoon dried dill.
Tzatziki is delicious with Greek dishes such as gyros or souvlaki. But it is also delicious as a side dish, for example at a bbq.