Set crockpot at high. Break in chocolate, add half & half, milk, coffee, brown sugar, vanilla, spices and salt. Stir and cover. Cook, stirring thoroughly every 15 minutes, until chocolate has melted completely, about 1 hour. Add orange peel and stir. (Use a vegetable peeler to cut the orange peel into a long spiral.) Serve immediately, or turn crock to low and keep covered, removing orange peel after 15 minutes. Served with whipped cream.