
Dressing - Shake the ingredients in a jar until well combined (or whisk in a bowl). Set aside to let the flavours meld while you chop.
Toss - Put the cucumbers, herbs, onion and most of the feta in a bowl (reserve a bit for topping). Add dressing and toss.
Serve - Pour into a serving bowl. Top with remaining feta and serve straight away, though it keeps well for an hour, and I still enjoy it the next day (it becomes semi-pickled).