1. Heat the pan, add oil and saute onions for 5-6 minutes.
2. Add celery and thyme and saute for 2-3 minutes.
3. Add sweet potatoes, garlic, marjoram and a pinch of salt and saute for 5 minutes.
4. Add horseradish and chili pepper and saute for 1-2 minutes.
5. Add cream and parsley, and use a stick blender or a fork to make a puree.
Serve with a patty or a minute steak.
Enjoy your meal!