Bring a small pot of water with a splash of vinegar to a gentle simmer and use an instant read thermometer to confirm the temperature is between 180-190F.
Crack the egg into a wire mesh strainer to remove the watery egg whites, then gently transfer the egg into a small bowl.
Use a small spatula to swirl the water in the pot to create a gentle whirlpool effect.
Dip the edge of the small bowl with the egg in it into the water and gently tip the egg into the water. The egg will tumble and twist for a moment before settling into the center of the pot.
Cook for 4-5 minutes, gently swirling the water around the egg (without touching the egg) periodically. If the egg sticks to the bottom of the pot gently slip the edge of a small silicone spatula under the egg to release it.Check the temperature throughout the cook time to maintain a temp between 180-190F.
When the egg is done cooking, remove it from the water using a slotted spoon. Place the spoon on a paper towel to absorb any water from the bottom of the egg, and dab at the surface of the egg with another paper towel to remove any water pooling on the surface.
Serve immediately or store in the fridge. To reheat, simply drop into boiling water for 30-60 seconds before serving.