Step 1

Use a small jug or if your immersion blender comes with a jar then use that. Add all of the ingredients, and wait for 30 seconds for everything to settle and the oil to float to the top (you need the egg and mustard to be at the bottom underneath the blender).

Step 2

Place the stick blender in the jug so it covers the egg yolk and touches the bottom, and run it for 15-20 seconds without moving it. Once you start seeing an emulsion, you can start moving it up and down until everything is incorporated. Remove the blender, stir the mayo and that's it!