Start by measuring out all your ingredients.

In your blender or food processor, combine the egg and Dijon mustard. Blend on medium speed for about 10 seconds until combined.

Add the white vinegar into the mixture.

With the blender running, slowly drizzle in the neutral oil.

Continue blending until the mixture thickens and turns creamy, about 30 seconds to a minute.

Once thick, taste your mayonnaise and add salt as needed. Optionally, squeeze in some lemon juice.

Transfer the mayonnaise into a clean storage container.

Clean your equipment right away.