01 - In a blender or food processor, combine the chopped cucumbers, basil leaves, scallions, garlic clove, 1 cup Greek yogurt, sour cream, vegetable broth, lemon juice, 1 tablespoon olive oil, sea salt, and black pepper. Blend until the mixture is completely smooth and homogenous.
02 - Carefully taste the blended soup. Adjust the seasoning as desired by adding more salt, freshly ground black pepper, or lemon juice.
03 - Transfer the soup to an airtight container. Cover and refrigerate for a minimum of 1 hour to ensure it is thoroughly chilled and the flavors have ample time to meld.
04 - Prior to serving, in a small bowl, whisk together 2 tablespoons of Greek yogurt with 1 teaspoon of water until the mixture achieves a smooth and pourable consistency.
05 - Ladle the chilled soup into individual serving bowls. Artfully drizzle the thinned yogurt mixture over the soup, add a delicate touch of olive oil, and finish with fresh basil leaves for garnish.
06 - Present the chilled basil and cucumber soup immediately after garnishing.