Put the reserved chicken fat in a 2- to 3-quart pot over medium-high heat. When the fat is warm, add the shallots; cook, stirring occasionally, until lightly browned, about 5 minutes. Add minced garlic and rice and cook until lightly toasted, stirring to coat another 2 minutes or so. Add 4 cups reserved chicken stock and bring to a boil, then reduce heat to low and cover; cook for about 18-20 minutes or until rice has absorbed all liquid. Stir in salt and pepper to taste.