Fill a medium saucepan with water up to about 3 inches deep.

Stir in the vinegar if using.

Bring the water to a gentle simmer over medium heat.

Crack one egg into a small bowl or ramekin.

Use a whisk to stir the water gently in a circular motion.

Carefully slide the egg from the bowl into the center of the whirlpool.

Let the egg cook for about 3 minutes for a soft yolk.

Using a slotted spoon, gently lift the poached egg out of the water and allow it to drain briefly before serving.