The serving size was reduced to 2 servings and still produced ample dressing. Made as per ingredients to include the optional oil. I did taste the dressing before the optional oil was added and it was a little tart. Even with that addition the dressing was somewhat thin. It does have a great flavor. I did use my immersion blender to blend the dressing. Thanks for the tip and for the dressing.
LOVELY! used this as part of my start of WW, a 2 point dressing with massive flavor, thanks for posting!