One of the beagle's favourite things about this drink (apart from its relationship to the 'dog's nose') is the creamy texture that the Guinness gives. If you serve this cold enough and froth it up well enough, it can feel like a toasted gingerbread ice cream float. As well as that, the froth created by the aerated Guinness gives an excellent surface for a sprinkling of grated cinnamon.
Combine all ingredients in a mixing glass with cubed ice. Aerate with Aerolatte or whisk and then pour into a glass over fresh ice. Garnish with a sprinkle of grated cinnamon and nutmeg.