To a small saucepan, set over medium heat, combine brown sugar, water and maple syrup. Bring to simmer for about a minute, until the sugar has dissolved. Pour the maple syrup mixture over the macadamia nuts, sprinkle with a teaspoon of salt and toss once more. Transfer to the center of the baking sheet and spread out in one even layer. Bake for about 8, until lightly toasted. Sprinkle with remaining black pepper and toss. Bake for an additional 5 minutes. Allow to cool until warm on the baking sheet, breaking them apart with your hands to avoid sticking.