The smell! It is dominated by cinnamon and other Christmas spices such as star anise/clove.
The taste! It's not sour at all, you just feel an explosion of spices, dried raisins/apples with possible walnut-type bitterness and a lovely long aftertaste
I feel that putting rum in there is a recipe for an ideal energy punch :D
I could drink this all winter - limited edition :(
Recipe
Aeropress - coarse espresso grind, water 95°C, 2 filters, 9g of coffee -> 40g of water and 30s bloom -> add another 150g of water, stir, seal with a plunger -> let it stand for 1.5-2 minutes -> squeeze out slowly for approx. 20 -30 seconds. Finally stir to combine all the flavors.