Chop 5-7 leaves of fresh sage and 6 cloves of garlic into pieces small enough to mix evenly in a food processor. you don’t have to mince.
In a food processor, add 4 tbsp. of softened unsalted butter, 2 tbsp. olive oil, juice from half a lemon and the chopped garlic and sage. Process till creamy with small flecks of sage and garlic. Set aside.
Pat 5 Cornish game hens with paper towel, and place them in a 4 quart baking pan or pyrex. Cut about 1½ feet of baking string and tie their legs close to their body by wrapping each leg first, then securing them together with a bow.
Fill each cavity with stuffing, but don’t over-stuff. Leave most of the stuffing to serve as a side dish.
Lift the skin of the breast and spoon in some of the garlic-sage butter. Make sure it’s nicely distributed under the skin (It helps to use a spoon to separate it first).
Roll up your sleeves and give the hens a luxurious massage with the garlic-sage butter. Make sure to cover every part of them, including between the legs and breast.
Sprinkle them with 1 tsp. salt and 1 tsp. pepper, making sure to evenly distribute all over the hens. Bake for 45 minutes or until a meat thermometer shows 165 F (74 C) in the thickest parts, like the thigh and breast. Allow to sit for 15 minutes under tin foil before serving.