Foolproof Mayo - Whole30 Paleo Compliant

Full instructions found here-
http://thehealthyfoodie.com/fail-proof-home-made-paleo-mayo-whole30-compliant/

Here’s what you’ll need to make a basic homemade mayonnaise:

Equipment:
•1 glass jar, which you will use to both make AND store the mayo. Make sure that you use A TALL AND NARROW JAR with an opening that’s just wide enough to accommodate your stick blender. I like to use a 500ml (one pint) wide mouth Mason jar like the one in the pictures.
•An immersion blender. That’s the magic tool that’ll make your mayonnaise come together so easily. And yes, it must ABSOLUTELY be a stick blender. Nothing else will work.

Ingredients:
•One WHOLE large or extra-large fresh egg (apparently size does matter here. Make sure you use a large or extra large egg, else you might need to add an extra one)
•One cup Extra Light Tasting Olive Oil
•The juice of half a lemon or lime (about 2-3 teaspoons) or an equivalent quantity of vinegar. Any vinegar will do, but my favorite one to use is Apple Cider Vinegar.
•A generous pinch of salt