This is the Secret Ingredient Grandma Used for Her Coffee

pot. Pour in the cold water and stir gently to combine.

Place the pot over medium heat and bring it slowly to a near-boil. Watch for tiny bubbles to form around the edges—about five to seven minutes—but do not let it reach a rolling boil.

Remove from heat and carefully pour in half a cup of cold water. This sudden temperature drop encourages the coffee grounds and egg mixture to sink to the bottom. Let it rest, undisturbed, for five minutes.