Using a pestle or cocktail muddler, lightly bruise the rosemary needles. In a small saucepan, combine the rosemary with the honey and water and warm over moderately low heat for 5 minutes. Remove from the heat and let stand for 30 minutes. Transfer the rosemary-infused honey to a serving bowl or small pitcher.
Meanwhile, using a sharp knife, peel the oranges, removing all of the bitter white pith. Cut the oranges crosswise into 1/4-inch-thick slices and arrange them on platters. Season the oranges lightly with salt and drizzle with some of the infused honey. Serve with additional honey alongside.