1 pasture egg yolk
1/2 cup walnut oil
1/4 cup olive oil
juice of 1 lemon
1/2 teaspoon salt (or more, or less)
1/2 teaspoon honey (or more, or less)
Put the yolk, salt, honey, and lemon juice into the bowl of a stand mixer with a whisk attachment. Mix briefly. With the mixer on high, add the oils (I measured them both into a Pyrex container and poured from the spout) a few drops at a time until it starts to look lighter. Switch to a steady but very small stream of oil until you've used all of the oil and you have miraculously ended up with mayonnaise!
I tried to make stick blender mayonnaise and failed. I'm going to stick with using the Kitchen Aid as long as I'm using the expensive oils (which make failure scary).