Using the container that came with your immersion blender or a wide-mouth pint mason jar, add all the ingredients in the order listed. Let this stand about 5 minutes so everything equalizes.

Place immersion blender in the container with the head touching the bottom of the container and blend at high speed until mixture begins to emulsify--it'll turn white--about 1-2 minutes.

Place in a container with a tight-fitting lid (or if you used a mason jar, just put a lid on it) and store in the refrigerator. It lasts about 1 week.