• Grate the cucumbers using a coarse grater into a colander.
• Place the colander over a bowl and leave overnight to drain (this is VERY important - all the water must drain from the cucumber).
• Add the grated cucumber to a mixing bowl and stir in the yogurt, crushed garlic, olive oil and salt and pepper until all the ingredients are really well blended.
• Cover the bowl with cling film and chill for a few hours so that the flavours develop.