In a high speed blender, combine the chopped cucumbers, cashew butter, lime juice, honey, fresh basil leaves, salt and pepper and blend until smooth. Taste the soup and adjust the seasoning. If the soup is too thick you can thin it with cold water, a little bit at a time. Chill the soup for at least 4 hours. When you're ready to serve the soup, remove from the refrigerator and give it a stir. Serve the soup in bowls and garnish with thinly sliced cucumber, a drizzle of olive oil and fresh chopped herbs.