Heat the oil in a frying pan. Fry the buckwheat over a medium heat for approx. 5 mins., stirring occasionally. Add the walnuts and thyme, cook for approx. 5 mins., season with salt. Set aside the buckwheat crunch.
Place the cheese slices in the raclette pans, add the buckwheat crunch, drizzle a little pear syrup over the top. Melt the cheese under a raclette grill for approx. 8 mins., serve with the potatoes.