classic chicken pot pie

Ingredients For classic chicken pot pie

• 4 lb

  chicken stock
• 3 sprig

  thyme
• 2 md

  yellow onions, chopped
• 2 md

  ribs celery, chopped
• 1 md

  carrot, chopped
• 3 to 4 lb

  whole chicken parts
• 1 md

  bay leaf
• 8 Tbsp

  unsalted butter
• 1/2 c

  creme fraiche
• 1/4 c

  finely chopped black truffles,plus 18 thin slices
• 2 Tbsp

  black truffle oil
• 2 Tbsp

  fresh lemon juice
• To taste

  kosher salt and freshly ground black pepper
• 2 c

  each cooked pearl onions, peas and baby carrots, cut 1/2" pieces
• 2

  sheets puff pastry
• 2 lg

  eggs, beaten- for egg wash on pastry