Bring a pot of water to a gentle simmer (small bubbles, not a rolling boil)
Add a splash of vinegar to the water (optional)
Crack an egg into a small bowl or cup
Stir the water gently to create a whirlpool
Slide the egg into the water carefully
Poach until the whites are set and the yolk is cooked to your preference
Remove the egg with a slotted spoon
Drain on a paper towel or clean plate
Serve immediately