Pour hot black coffee into a warmed mug.
Rest a bar spoon across the rim and place a sugar cube in the bowl of it.
Pour the cognac over the sugar until it is soaked.
Ignite the spoon carefully and let it burn until the sugar starts to caramelise, about 15 seconds.
Lower the spoon into the coffee to extinguish it and stir once.
A 19th-century French café habit, often attributed to Napoleon's officers and impossible to verify. It is the same idea as the Café Brûlot with all the spice stripped out — quicker, quieter and a better use of a good cognac.
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