I had no idea mayonnaise could taste so good.
I spent most of my life with no idea that making your own mayo was easy. I had this vision of Julia Child unsuccessfully attempting to emulsify her mayo, painstakingly drizzling oil into a blender. Holy smokes was I wrong. And the store stuff has so much nasty stuff in it, and I have more eggs than I know what to do with in the summer - I don't know what I was thinking! The least gross (ingredient-wise) pre-packaged mayo I ever found was Hellmann's, which still contains canola oil (which is both linked to cancer, and extracted using a fairly icky chemical extraction using compounds derived from petroleum), a bit of added sugar, and calcium disodium EDTA as a preservative.
I have been using this recipe for a few years with great success; generally I use 1 cup of extra virgin olive oil. If you are up for watching the stick blender YouTube, it is very helpful. The resulting mayonnaise does taste olive-y, which I like, but if you weren't so keen on that a slightly more expensive option that works well is to use half extra virgin olive oil and half almond or avocado oil. I haven't tried using the "light tasting" olive oil, but that could work as well. I am going to try it, next, with liquefied (not too hot, as that would cook the egg!) coconut oil.
For the acid, you can use apple cider or any vinegar or lemon juice
For the spices, I usually use wasabi powder or paprika and Dijon mustard,
To make 30 second Caesar salad dressing, put one cup of extra virgin olive oil (or other pressed oils), 1 egg, 1 T Dijon mustard, 3 cloves of garlic, 6 anchovy fillets, 1 t black pepper, and 1 t sea salt in a tall container and let sit for 10 minutes. Blend from bottom up with the stick blender ala the YouTube tutorial (adapted from the Primal Palate Caesar dressing).
To make easy Green Goddess salad dressing, take half a cup of your basic mayonnaise, and add 1/2 cup coconut milk, 1/4 each fresh green onions, tarragon, and chives, 2 anchovy fillets, 1 garlic clove, and 1 t black pepper and use the immersion blender to combine (adapted from Maria Mind Body Health Green Goddess dressing recipe).