Wash the herbs, peel the garlic and the cucumber if desired. Some like cucumber with the peel on.
Shred the cucumber and the garlic then finely chop the herbs up.
Place the cucumber, garlic and herbs into a container. Some like to strain the cucumber but if the Greek yogurt is thick enough then pressing out some of the liquid is enough.
Add the Greek yogurt, olive oil and salt.
Mix everything well.
Put the freshly made Tzatziki sauce into the fridge for a couple of hours that will let the flavors come together.