Potato, Green Cabbage, and Leek Soup with Rock Fish

This was definitely a soup day. It has been raining since late last night and even though it was warm earlier, it is now cold. I made the soup from the March Bon Appétit. It says serves 6. We probably have 2 servings left over. I thought it was very filling.
Potato, Green Cabbage, and Leek Soup with Lemon Crème Fraiche
Ingredients:
½ C crème fraiche or sour cream (I used sour cream, reduced fat)
1T fresh lemon juice
¼ t finely greated lemon peel
2 T butter, divided
1 T EVOO
6 C diced green cabbage (1/2” dice, from about ½ medium head)
3 C chopped leeks, white and pale green only
3 large garlic cloves, pressed
3 C ½” cubes peeled Yukon Gold potatoes, about 11/4 #
1 2x2 “ piece Parmesan cheese rind (optional) I had and used
1 bay leaf
6 C low-salt chicken broth
2 T chopped fresh chives for garnish.
Directions:
1. Whisk sour cream, lemon juice and lemon peel in a small bowl. Cover and chill.
2. Melt 1 T of butter with 1 T EVOO in about an 8 C pot. Add cabbage, sprinkle lightly with salt and freshly ground pepper. Sauté until cabbage is almost tender but not brown, 6-8 minutes. Using a slotted spoon, transfer 1 C cabbage to a small bowl and reserve for garnish.
3. Add an additional 1 T butter, leeks, and garlic to the cabbage. Sauté over medium heat until leeks soften slightly, about 3 minutes. Stir in potatoes, Parmesan rind and bay leaf.
4. Add 6C broth and bring to a boil. Cover and simmer for 25 minutes.
5. Remove the bay leaf and the cheese rind (mine was disintegrated)
6. Using an immersion blender, puree soup until smooth. I needed to add 1 ½ t salt to make tasty. I also added about ½ t pepper.
7. Ladle into bowls. Top each serving with some of the reserved sautéed cabbage. Drizzle the sour cream mixture and top with a sprinkle of chives.
I served this with rock fish that I topped with a flavored butter, salt and pepper. I wrapped the rock fish in a Savoy cabbage leaf and used my Advantium over to cook. It was loosely based on a Halibut recipe on the same page but about 4 paragraphs shorter.
We liked the rock fish but were so, so on the soup.