Lay a sheet of baking paper on a chopping board; top with bread. Spread each slice with butter; sprinkle each evenly with ½ tsp dukkah. Turn so the buttered-side faces down. Top 2 slices bread each with 2 slices cheese, 3 slices pastrami, 2 tbsp sauerkraut and 1 tbsp thousand island dressing. Season to taste. Top with remaining cheese and bread, buttered-side facing up.
Preheat a jaffle maker. Toast sandwiches in hot jaffle maker for 4 minutes or until cheese melts and bread is golden and crisp.