Tie the hens' legs together with twine so that the legs cover the open cavity of each hen.
Pour chicken broth in bottom of roasting pan and then cover pan with foil.
Place in a preheated oven at 350 and cook for approx. 75 mins.
Remove hens from oven and remove foil, then raise heat to 420.
Baste hens with broth thoroughly then return to oven.
Cook until golden then remove from oven and set hens aside to rest.
Place roasting pan on high heat and add vinegar and thyme, stir to deglaze.
Remove from heat once gravy has reduced by one third.
Serve immediately.