Fill an aluminum, stainless-steel, or enamel-coated skillet almost to the brim with water. Add 1 teaspoon or so of white vinegar to the water and bring to a boil. Now add the eggs one at a time. The most sure-fire way of doing this is to break each egg into a small saucer, then gently slide the egg off the saucer and into the boiling water. With a little practice, however, it is more efficient to