Step 1

Place all the ingredients in the order given (egg, yellow mustard, salt, sugar, lemon juice, vinegar, and oil) into the cup that the immersion blender comes with, ending with the oil last.

Step 2

Plunge the stick blender onto the bottom of the cup. Turn the blender on and keep it on the bottom until the mixture starts to emulsify (10-15 seconds).

Step 3

Once the mayonnaise starts to thicken and emulsify slowly move the stick blender upward to continue to combine the ingredients. When it's almost combined I will then move my hand blender up and down to well combine any oil on the surface.

Step 4

Mayonnaise should be thick and hard to blend at this stage, give it a final stir.

Step 5

Transfer mayonnaise to an airtight container or squeeze bottle and keep in the fridge for up to 1 month.