Meanwhile, in 3-quart saucepan, heat 2 to 3 inches water to boiling; reduce to simmering. Add vinegar. Break remaining 4 eggs, one at a time, into custard cup. Holding cup close to water’s surface, carefully slip eggs into water. Cook 3 to 5 minutes or until whites and yolks are firm, not runny. Remove with slotted spoon.