Combine remaining ingredients. Marinate hens in mixture, turning frequently, for at least two hours. You can also do this the day before and Marinate overnight.

Divide garlic and onion between the two hens. Place in cavity and sprinkle inside with salt and pepper. Using cooking twine, truss the birds. Place hens in a roasting pan, breast side up.

Spoon 1/4 cup marinade over the hens and bake for 15 minutes. Spoon more sauce over hens. Continue to cook hens for about 20-25 more minutes.

Remove hens from the roasting pan. Pour pan juices into a saucepan, along with any leftover glaze. Bring to a boil. Remove from heat and skim off any excess fat. Serve hens along with sauce.