✔ 4 quarts water
✔ 1 1/2 cups freshly ground coffee
✔ 1 egg shell
✔ 1/2 cup cold water
1. Bring water to a boil in a large saucepan or coffee pot. Add coffee grounds and egg shell to boiling water.
2. Return to a boil, then remove from heat and let stand for 2 minutes. Slowly add cold water to settle grounds to the bottom. Strain if desired.