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The cocktail in question comes from an edition of Jerry Thomas's Bartenders Guide, published in 1887. Despite bearing the name of coffee, the cocktail’s ingredients do not include coffee or bitters—a fact that the recipe openly acknowledges. Instead, you’ll require:
1 teaspoon of powdered sugar
2 ounces of port wine
1 ounce of brandy
1 fresh egg
It’s important to note that the presence of raw egg could pose health risks such as salmonella, so ensure that the egg is clean, uncracked, and refrigerated.
To make the cocktail, start with a vigorous dry shake to achieve a nice frothy texture. Follow this by adding ice and shaking again until chilled, then strain into a glass. A garnish of freshly grated nutmeg completes the presentation.