I like to prepare small batch dressings like this one in the mini food processor attachment of my stick blender, but feel free to use any blender or food processor. (californiaavocado.com)
I got the one that comes with an fun little food processor attachment. (sweetteasweetie.com)
We have a mini food processor attachment to our immersion blender, and that's my best friend when preparing ingredients like these. (tofufortwo.net)