Clean, wash and cut the salad into bite-sized pieces. Clean and wash the cucumber and cut it in half lengthwise. Scrape out seeds with a spoon and cut halves into thin slices.
Radishes, except for a few for garnishing, clean, wash and cut into thin slices. Peel and wash carrots and cut them into small sticks. Peel garlic and press it through a garlic press or chop it finely.
Mix buttermilk, cream, lemon juice, garlic, some salt, pepper and sugar. Season the dressing to taste. Arrange prepared salad ingredients on plates. Spread the dressing on top. Serve garnished with the remaining washed radishes.