Add the egg and oil to the jar

• Crack the room-temperature egg into a tall jar or bowl.
• Pour in the oil.

Add the lime juice and salt

• Squeeze in the lime juice.
• Season with the salt.

Blend into mayonnaise

• Place the immersion blender at the bottom of the jar.
• Blend without lifting until the mixture starts to emulsify, then slowly move the blender up and down until thick and creamy.