Combine creme fraiche, horseradish cream, mustard and cornichons, season with salt and pepper

Preheat jaffle maker until green light switches on

Butter one side of each slice and place buttered side down. Spoon creme fraiche mixture evenly over 4 slices and top with roast beef and radicchio. Cover with second slice, buttered side up. Place into jaffle maker, close lid and cook 3 minutes or until bread is golden and crisp

Serve hot with fries