Step #1 The type of container is important for this.
Step #2 You want a tall, thin jug in which to mix the mayonnaise.
Step #3 My friend used a measuring c that very much resembled a glass beaker like you would see in a science lab.
Step #4 Put the egg, mustard & pepper in the jug.
Step #5 Pour in the oil.
Step #6 Put a hand mixer in the container, push it all the way to the bottom & then turn it on, slowly pulling it up towards the top of the jug as you see the mixture turning into mayonnaise.
Step #7 Pour in the lemon juice once you have your jug of mayonnaise & stir or blitz one more time to mix.