In a food processor (or hand-held emersion blender) mix egg yolks, lemon juice, a pinch of salt, and pepper for a few seconds with the mixer running on medium speed, slowly drizzle a thin stream of olive oil into the egg yolk mayonnaise will begin to thicken after about ¼ cup oil is added, at that point adding a faster stream of oil is fine and will make the process go faster continue to add oil until mixture is thick, not all of the olive oil may be used to complete your mayonnaise, you may also add more lemon juice to thin the recipe if it becomes too thick