Peel, wash and grate the carrots. Clean the celery and put some leaves aside for garnishing. Wash the celery and cut into wafer-thin slices. Clean and wash spring onions and cut them into rings.
Mix vegetables and currants. For the sauce, stir sour cream, mayonnaise and lemon juice until smooth. Season with salt and pepper. Mix sauce and salad. Cover and leave to stand for about 1 hour. Season again and serve garnished with celery leaves and lemon.