[header] How to use leftover eggnog [title] Brew a cup of coffee. [step] Use your favorite type of coffee to make a 20 ounce (591 ml) cup. You can use a traditional coffee machine, a single-serve coffee machine, a french press, or even an instant type that you simply mix with hot water. 
It's best to use unflavored coffee to allow the eggnog flavor stand out, though. [substeps] If you want to use a flavored coffee, be sure that it's a flavor that will complement the eggnog.