In a large bowl combine the mayo, sour cream, vinegar, Dijon mustard, sugar, lemon juice, chopped onion, diced celery, fresh dill, salt, and black pepper. Mix well to combine. Add the cooled ...

When melted, add the diced onion, the bay leaf, and the thyme sprigs. Cook until the onion is soft, without browning, about 12 minutes. Meanwhile, prepare the leek and celery root. When the onions are ...