Clean and wash the celery, cut it into pieces and blanch it for 2 minutes in boiling salted water. Clean, wash and quarter iceberg lettuce, cut out stalk. Cut lettuce into strips.
Wash the tomatoes and cut into eighths. Cut ham and cheese into sticks. Wash the chives and cut into small rolls. Mix yoghurt and sour cream. Season with salt, pepper and paprika. Stir half of the chives into the yoghurt.
Mix celery, iceberg lettuce, tomatoes, ham and cheese and arrange in a bowl, pour the yoghurt marinade over it and sprinkle with the remaining chives.