To make the gingerbread sauce…In a small saucepan, combine the water, sugar, cinnamon, ginger, and vanilla.
Bring to a boil, stirring, until the sugar dissolves. Reduce heat and simmer slowly for 15 to 20 minutes. This part will have your home smelling so good!
Combine the espresso in a mug and add ¼ cup of the gingerbread syrup. Top it off with the heated milk.
If you desire, garnish with some whipped cream and a sprinkle of grated nutmeg.