Fennel seeds are what flavor many a Portuguese-style bread, including these rolls. The little seeds pack a powerful punch in terms of their licorice flavor, and are commonly paired with ground cinnamon (as in this recipe). If the temperature is too cold to allow the dough to rise sufficiently, you can tuck it (covered) into an oven that's on the lowest heat setting. Whole wheat flour replaces more than half of the regular flour here for a more wholesome roll with a chewier texture.