Chicken With White Wine And Crème Fraîche

Name: Chicken With White Wine And Crème Fraîche
Ingredients: 2 tablespoons olive oil; One 3 1/2-pound chicken, cut into 8 pieces; Kosher salt and freshly ground pepper; 1 cup chicken stock; 1 cup water; 1/2 cup dry white wine; 1 carrot, halved lengthwise; 1 celery rib, halved lengthwise; 1 leek, white and tender green parts only, quartered lengthwise; 1 medium onion, halved; 2 garlic cloves, halved; 2 bay leaves; 1 clove; 1/2 teaspoon whole peppercorns; 1/2 cup crème fraîche; 2 tablespoons unsalted butter