Potato, Green Cabbage, and Leek Soup with Lemon Crème Fraîche Recipe | Epicurious

Ingredients

• 1/2 cup crème fraîche or sour cream
• 1 tablespoon fresh lemon juice
• 1/4 teaspoon finely grated lemon peel
• 2 tablespoons (1/4 stick) butter, divided
• 1 tablespoon extra-virgin olive oil
• 6 cups diced green cabbage (1/2-inch dice; from about 1/2 medium head)
• 3 cups chopped leeks (white and pale green parts only; 3 to 4 large)
• 3 large garlic cloves, pressed
• 3 cups 1/2-inch cubes peeled Yukon Gold potatoes (about 1 1/4 pounds)
• 1 2 x 2-inch piece Parmesan cheese rind (optional)
• 1 Turkish bay leaf
• 6 cups (or more) low-salt chicken broth
• 2 tablespoons chopped fresh chives (for garnish)