While I cooked the base, Dylan used my mortar and crushed the nibs for me.
In a saucepan over medium heat, stir together all ingredients except the nibs. Keep stirring until the mixture begins to thicken, about 10-15 minutes. Pour into a buttered bowl and refrigerate for about two hours. Once the mixture is cooled, with buttered hands - yes, do it! - roll the mixture into small balls. Roll each ball in the nibs and place it on a plate to harden into shape.