Break your egg into a small bowl or glass, so you can easily plop it into the water.
Fill a liter of water in a pot and bring it to a boil.
Add 3 tablespoons of vinegar. Reduce the heat so the water is just below boiling point.
Stir vigorously in the water with a whisk, creating a whirlpool in the center.
Carefully pour the egg into the center of the whirlpool without stirring.
Let the pot stand while the water spins, allowing the egg white to gather around the yolk.
Now, let the egg stay in the pot for about 2-3 minutes. The white should be firm and the yolk runny.
Carefully remove the egg with a slotted spoon and serve it, for example, with a delicious pasta dish or on rye bread with avocado.