IMPORTANT: Make sure all ingredients are at room temperature before blending. This step is crucial for it to emulsify properly.
Using the jar that came with your immersion blender or a tall, skinny wide-mouth mason jar, add all ingredients, except the oil.
Once you've added all ingredients, pour the oil into the jar and allow a few seconds for the oil to separate (it should sit on top of the other ingredients).
Place the immersion blender firmly onto the bottom of the jar and blend on high for 20 seconds.
Once the bottom begins to emulsify, you can start to move the blender up and down until everything is fully emulsified.
Once it's fully emulsified, remove the blender, give the mayonnaise a good stir, and transfer it to a container with a lid.
Place in the fridge immediately. This will stay fresh in the fridge for up to 7 days (do not freeze).
