Take a bowl, add the yoghurt, grated cucumber, dried mint, fresh mint, crushed garlic, 1 tbsp of olive oil, lime juice, salt and pepper and stir. Taste and adjust seasoning or other flavours as desired.
Cover the bowl and leave in the fridge for the flavours to intensify and mix well through the yoghurt (no less than 1 hour). When you are ready to serve the Maast O'Khiar, drizzle some olive oil on top and decorate with fresh mint and / or cucumber and / or dried rose petals and / or dried mint.
Serve alongside a Persian spread, as part of a mezze-style spread of dishes, or as an appetiser. Or like some Iranians, sit in front of the telly with a bowl of Maast O'Khiar and a massive bag of crisps and dip away!