Add some extra scoops to make the coffee stronger. Next, separate the yolk from the egg white like this. Drop it into a cup and add a teaspoon of sugar. Then whisk the yolk and sugar together until it becomes thick and foamy, like a nice creamy gold mixture. After that, pour the hot coffee straight in and stir. The heat from the coffee lightly cooks the egg yolk, while the sugar evens out the richness. Pour in a bit of milk, stir it well, and enjoy your coffee with an egg.