This is all you need. Simple :-). Optional: mint leaves of 10 stems (I forgot to buy).
(clockwise) cut cucumber into half; use a teaspoon to remove the liquid part (dont throw away!); cut into half; cut into strips; cut into small pieces; this is how it should look like
(clockwise) two cloves of garlic; lay down the knife on the garlic; hit the knife on the garlic a few times; now you have smashed garlic :); chop garlic into fine pieces; it should look like this
Add yogurt into a bowl and add the chopped cucumber and garlic. Mix very well untill it looks like this. Put it in the fridge for at least one hour to cool the tzatziki :).
The liquid part of the cucumber: eat it - its sooo fresh :)!
Out of the fridge... Tadaaa :-)!
Serve with Turkish köftes (my other guide!) or any meat dishes or bread :d!