Clean / peel and dice the celery. Peel, wash and dice the potatoes. Cook the celery cubes with the potato cubes in salted water (1 teaspoon salt) ground with turmeric (1 teaspoon) for about 20 minutes, drain through a kitchen sieve and return to the hot saucepan. Add butter (1 tbsp), cooking cream (1 tbsp), grated Parmesan (2 tbsp), coarse sea salt from the mill (2 big pinches), colored pepper from the mill (2 big pinches) and freshly grated nutmeg (1 big pinch) and work through / pound well with the potato masher.