Cook bacon in a large frying pan for 5 minutes or until crisp and golden, remove and set aside. Mix aioli and harissa together

Preheat jaffle maker until green light switches on

Butter one side of each slice and place bread, buttered side down. Spread aioli mixture evenly over 4 slices and top with bacon, tomato and rocket. Cover with remaining bread, buttered side up. Place into jaffle maker, close lid and cook 3 minutes or until bread is golden and crisp