Pour the juices from the roasting pan into a small bowl; spoon off the fat and reserve the brown drippings. Place the roasting pan over moderate heat. Add the remaining chopped shallot and garlic and stir until softened and golden, about 2 minutes. Pour in the wine and bring to a boil. When the wine is nearly evaporated, pour in the chicken stock and heavy cream. Bring to a boil and simmer, stirring occasionally, until reduced to 1/2 cup, about 4 minutes. Stir in the reserved drippings and the minced basil and season with salt and pepper.