Mince the Garlic
Add to a mortar and pestle
Using the pestle, pound down on the garlic until it becomes a paste
Add egg yolk to the garlic (discard egg white)
Add ½ tsp lemon juice
Add a pinch of salt
Start adding the extra virgin olive oil in a slow stream into the garlic and egg and start stirring without stopping
Continue to add the olive oil in a slow stream while never stopping to stir the aioli
Once you are done with all the olive oil, your aioli is done! It should have the consistency of mayonnaise