This recipe makes a mayonnaise that results is a great texture at room temperature. If you’re not going to use it all right away it is best if you store the leftovers in the fridge and set it on the counter 10-20 minutes before you want to use it. It’s still spreadable when cold, just very thick.
I use a stick blender and a wide mouth mason jar to make this quickly and easily with minimal clean up. You could also use a regular blender.