Add aquafaba, mustard, vinegar, salt, garlic and cayenne (if using) to jar.
Pour in oil and let ingredients separate for 30 seconds
Insert immersion blender and push all the way to the bottom of the jar.
Blend on high without moving blender for 20 seconds, as mixture transforms into creamy white mayonnaise and makes its way to top of jar.
Slowly raise blender to top, continuing to blend until oil is completely incorporated.
Store refrigerated for up to 2 weeks.
Notes
While this recipe is simple to execute, the full post contains crucial information about ingredient quality, equipment requirements and technique details that are essential for success. Please take the time to read through the complete guide before making this recipe to ensure the best results.