Place the eggs, vinegar, lemon juice, and mustard into a jar.
Mix with an immersion blender to combine
Slowly, stream the avocado oil into the jar and continue blending with the immersion blender to combine.
Don’t add the oil too fast! If you add the oil too quickly and don’t allow the mixture to combine slowly, the avocado mayo can split
After blending, give it a good stir with a spatula and cover the jar with a lid.