That's the old way to make it...before pod machines and Mr Coffee.
Another way is to bring the coffee and water to a boil, then beat an egg and stir into the pot and let the grounds settle.
Linda C

I saw my mom make egg coffee as a child when an old-country Swedish aunt came to visit. Remembering later, as an adult, I asked her to make it so I could find out why. But I could never taste any advantage to it. She said it was just an old farm way to keep the grounds together before perforated filter baskets were available.

My Swedish Aunts used to make egg coffee, also.

And when the power was out last week and the Senseo and the Mr Coffee things didn't work...but with a match you could get the gas cook top to work...it was egg coffee time!
Linda C