Often it is, but you can make it without the alcohol as well. It's just milk or cream, sugar, egg, and spices.

[ Momo doesn't know much about coffee, having tea as her drink of choice, so she's happy to let Kaneki handle that much. ]

Alright. If you're sure, I'll leave the coffee to you.

[ Though Kaneki, you must realize if you agree to host a dinner and then don't eat or drink anything, people are going to notice. ]