Step 2Remove leaves from tarragon, roughly chop stems and place in chicken cavity. Chop leaves and mix 2 tablespoons with half the butter. Slide your hand beneath chicken skin to loosen, smear herbed butter under skin, then pat skin back into place. Place in a roasting pan and brush with oil. Roast for 1 hour or until cooked.
Step 3Melt remaining butter in a pan over medium heat, then add bacon and cook for 2 minutes or until starting to crisp. Add garlic, eschallots, peas, stock and remaining tarragon. Season with salt and pepper. Bring to the boil, then simmer over low heat for 5 minutes. Add asparagus and lettuce, then cook for 2 minutes. Stir in cream and mustard. Serve carved chicken with sauce and boiled new potatoes.
Step 4Serve the roast chicken with vegetables poached in stock.