Preheat your oven to 375 F.
Place the chicken breast side down on a cutting board. Cut along both sides of the backbone from end to end with a kitchen shear and remove. Flip the chicken breast side up, and open it like a book. Press firmly on the breastbone with your palm to flatten.
1 Whole chicken
In a small bowl, mix 2 tablespoon of your cooking fat with one garlic clove, minced, and sea salt. Loosen the chicken skin and spread half of the cooking fat mixture underneath the skin. Put 2 or 4 sage leaves under the skin, keeping them flat. Rub the other half of the cooking fat mix on the skin.
4 tablespoon Paleo cooking fat at room temperature, ½ teaspoon sea salt, 1 head garlic, Fresh sage leaves
Take half of the grapes and place them on the bottom of a roasting pan. With a potato masher, mash the grapes until the skin burst. Cut the remaining garlic horizontally and mix it whit the grapes. Add 2 tablespoon of cooking fat to the mix.
2 pounds red seedless grapes
Place the chicken in the roasting pan on top of the grapes, opened like a book breast-side up, and cook in the oven for about an hour.
Take the other half of the grapes and put them on a cooking pan bake for the last 30 min of the required time for the chicken.
Once fully cooked, remove the chicken from the pan and serve on a plate with the cooked grapes on the side, and you are ready for a feast.
You can use the juice from the grapes to make a delicious sauce.