Melt the butter along with a little drizzle of vegetable oil and then add the onion and celery ... the potato is well cooked through. Check for seasoning throughout the cooking. Take the soup ...

Using celeriac with traditional potato gives this healthy leek soup a velvety ... To make the stock, put the grated carrot, onion, celery and garlic into a large heatproof bowl.

celery, and garlic provide a good base flavor for potato soup, but warns to not over cook your potatoes. "Don't over boil ...