First, reserve 1/3 cup of the diced cucumber and set it aside for garnish. Then set up a food processor and combine the remaining cucumber, garlic, ginger, scallions, mint, cilantro, salt, pepper, yogurt and olive oil in it. Puree the mixture until it is completely smooth. Transfer it to a bowl and cover it, then let it chill in the refrigerator for at least 8 hours, or overnight. When you are ready to serve it, scoop it into pretty bowls and garnish it extra chopped cucumber, scallions and a drizzle of olive oil! Enjoy!!