Making your own mayo is very easy and much better than the stuff in the jar.
juice of 1/2 a lemon 1 egg 2 tsp dijon mustard 1/2 clove garlic, chopped 1 cup neutral oil (like vegetable oil) salt and pepper to taste
Find a container that is just a little larger than your immersion blender, or you can put this in a regular blender. You purists can do this with a whisk, but you really don't want to.
Whisk the egg and lemon juice together in the dish (or whisk and add to blender). Add the other ingredients.
If using an immersion blender, place the blender in the bottom and turn on. Blend until the bottom starts to look like mayonnaise then slowly raise the blender and let the stuff all mix together. If using a regular blender, blend and pulse at the end to get the correct consistency. Season with salt and pepper.