Peel the cloves of garlic, cut them in half, and remove the green sprout that you will find in the heart of the cloves.

Mash the cloves and place the pulp in a mortar.

Add the salt and mash with the pestle until you get a nice paste.

DO NOT peel the cucumber.  Cut lengthwise in half, and then each half again lengthwise.

Using a spoon, scrape off the seeds of each quarter.  You will be left with 4 "boats".  Grate them, let them strain, and squeeze any excess juice out.

Combine the yoghurt and strained cucumber in a large bowl, mix well.

Add the rest of the ingredients, and stir well.  The tzatziki is ready!  Taste and add more salt if necessary.