
Mayonnaise
This is very tricky--I often end up doing it twice. An easier version of the mayonnaise is decribed after this. Put 4 egg yolks & 2 tsp. distilled white vinegar into blender. Begin mixing at slow speed. After half a minute, while mixing, slowly add 1 cup of oil (prerably olive, but I often use vegetable oil instead) until the mixture is thick. The resulting mixture should be creamy, but still liquid enough that it pours out of the blender. About the consistency of molasses.
Easy Version of Mayonnaise (no raw eggs)
Mix one cup of standard mayonnaise (you are absolutely forbidden to use miracle whip or light mayonnaise--preferably stick with Kraft) with 2 tsp. distilled white vinegar. While hand-mixing the mayonnaise, slowly add olive oil until the mixture is about the consistency of salad dressing. I suspect that this requires about 1/3 to 1/2 cup oil, but I have not verified that this is exactly how much I end up putting in.
Variations
Add chives and/or celery. Don't add bacon. Add mustard to the mayonniase mixture.
Note that the required amount of potatoes, pickles, onions, and eggs, is all just a guess on my part--I typically just do whatever "looks right."