1 Rinse the chicory, shake dry, remove the core and separate the leaves.
2 Peel the avocado, cut in half, remove pits and cut into thin columns. Immediately sprinkle with lemon juice.
3 Peel the carrot and cut into matchstick large pins. Rinse, trim and cut the celery crosswise into thin slices.
4 Mix the yogurt, mayonnaise and tomato ketchup and season with salt, pepper and lemon juice to taste.
5 Arrange the vegetables on plates and serve with the sauce.