I just crush a clove of garlic garlic and stir it through natural yoghurt. If it needs it I put a bit of salt in. A tiny bit of mint (shredded or from a tube) is nice in it.

To make the cucumber yoghurt I just chop up cucumber really fine (the lebanese one or the long one because they have no seeds) stir it through the yoghurt and then add some oregano (from the tube) and sometimes a tiny bit of mint.