Bring medium saucepan filled about 2/3 full with water to a simmer over medium-low heat. Crack remaining 3 eggs into 3 separate ramekins or small bowls. Add vinegar to simmering water and, with slotted spoon, stir water to create a whirlpool effect. Gently tip one egg into center of whirlpool and let cook for 5 seconds. Gently re-stir water and add remaining eggs just like the first. Let eggs poach in gently simmering water until cooked as desired. For a runny yolk, poach eggs for about 3 minutes. To check for doneness, gently lift egg out of water with slotted spoon and poke egg with your finger. The egg white should be firm, and the yolk should be soft. Once done, using slotted spoon, transfer to plate lined with paper towel.