Step 1

Over medium heat combine the sugar and water and bring to a boil, stirring consistently. Once the sugar is dissolved, remove from the heat, and stir in the cinnamon. Let cool completely.

Step 2

Mix together the eggnog, vodka, and simple syrup in a martini shaker over ice.

Step 3

In a martini glass, drizzle the caramel syrup. Gently pour the martini over it. Top with whip cream and cinnamon.