For an elegant ridged pattern, place frosted cake on a cake turntable or a lazy Susan. Using the tip of a small offset spatula lightly pressed at the cake’s base, spin turntable and pull spatula gradually toward top. Repeat with top of cake, starting at center, working out to edge of cake, creating a spiral design. Smooth edges as needed.
*To make sugared cranberries and sugared rosemary, combine ½ cup granulated sugar and ½ cup water in a medium saucepan. Bring to a boil and cook, stirring occasionally, until sugar dissolves. Remove from heat and let cool to room temperature. Working in batches, dip rosemary and cranberries in sugar mixture, coating thoroughly; remove and let stand on a wire rack placed over a large rimmed baking sheet for 45 minutes. Dip glazed rosemary and glazed cranberries in sanding sugar, coating well on all sides and shaking off excess. Use within an hour.