For the chicory salad, wash the chic0rée, remove the outer leaves if necessary and cut in half. Cut out the stalk and cut the chicory into fine strips.
Wash the apple, cut into quarters and remove the core. Then cut into very fine wedges. Mix apple slices and chicory strips together. Mix sour cream and tomato ketchup.
Season with lemon juice, sea salt, pepper and horseradish and pour over salad. Mix lightly.