A few days before you make the coffee, split the vanilla bean in half the long way, and place it with the sugar in a closed container. To make the coffee, warm 2 brandy snifters. Take the wedge of lime and run it around the edge of the glass to wet the rim. Dip it in the vanilla sugar. Pour the orange liqueur into the glasses and, one at a time, light it on fire and tilt the glass to caramelize the vanilla sugared rim. Douse the flame with a little coffee. In a copper saucepan place the almond liqueur, cognac and coffee liqueur and warm them. Divide them between the 2 snifters then top them off with more coffee. Garnish with whipped cream, chocolate shavings and a straw.