Roast Chicken with Leeks and Fennel

Ingredients

• 1.5 kg whole organic chicken.
• 1 lemon, unpeeled, roughly chopped.
• 5 cloves garlic, unpeeled, smashed with the back of your knife.
• 5 sprigs fresh thyme.
• 5 stems Italian parsley.
• kitchen string (any string made of cotton or hemp).
• 5 tablespoons butter.
• 5 baby fennel or one medium fennel.
• 1 leek.
• 2/3 cups white wine.
• 2 bay leaves.
• 1 cup chicken stock.
• 2-3 tablespoons arrowroot (for gluten-free or Paleo) or cornflour, mixed to a paste in cold water.