Wash the cucumbers thoroughly.
Finely chop about one-third of one cucumber and set it aside for garnish.
Roughly chop the remaining cucumbers.
Add the chopped cucumbers to a blender along with the Greek yogurt and the juice of one lime.
Add the chopped tarragon, most of the mint leaves, and most of the chopped chives.
Blend until completely smooth and creamy.
Taste the Cucumber Soup and add the juice from the second lime if you prefer a brighter citrus flavor.
Chill the soup for at least 30 minutes for the best flavor.
Divide into serving bowls or small glasses.
Top with the reserved finely chopped cucumber, remaining mint leaves, and chopped chives.
Finish with a light drizzle of rapeseed oil before serving.