Chicken In Riesling

Ingredients

• 3 tbsp oil
• 1 (2 3/4 lb) chicken, quartered
• 3 None shallots, minced
• 1 clove garlic, minced
• 1/2 cup fresh flat-leaf parsley leaves, a little reserved for garnish, remainder finely chopped
• 1 sprig fresh tarragon leaves, finely chopped
• 1/4 tsp grated nutmeg
• 4 tbsp cognac
• 2 cups Riesling wine
• 1/2 lb button mushrooms, halved
• 1 tsp lemon juice
• 1 tbsp all-purpose flour
• 3/4 cup sour cream
• 1 None egg yolk