Add water to a pot, leaving a quarter of a cup of water aside. Bring the water in the pot to a boil.
Grind your coffee. Ideally, the coffee should have the same consistency as French press coffee, which is coarse. Medium to dark roast beans work best.
Crack your egg into a bowl. Crush the shell with your hands and add it in.
Then add your ground coffee and the water you set aside earlier.
Once the water on the stove starts boiling, lower the heat, and add the mixture to the pot. Let it simmer for about three minutes.
Once the coffee grounds begin to bind together and float to the surface, remove the pot from the stove.
Add one cup of cold water to the pot and let it sit for about 10 minutes. Doing this will make the grounds settle at the bottom of the pot, allowing you to pour a clean drink.
Optionally, filter the drink with a strainer or pour it into a French press and serve as normal.
Pour the coffee into a mug and serve. Add milk, creamer, or sweetener as desired.