1 part coffee (cold)
2 parts cognac (brandy)
sugar

crushed ice

cocktail glass

Fill a cocktail glass two-thirds fill of crushed ice. Add cognac (brandy), sugar (about a teaspoon for each regular-sized cocktail glass), and cold coffee and stir carefully. Serve with straws.

Traditionally this drink was served in polished glasses that were somewhat larger than a modern cocktail glass. That's why this is one of the very few cocktails that is served in a cocktail glass with ice and straws.