Chop the celery into pieces along with the parsley.
Place everything into a blender.
Blend.
Store in a mason jar in the refrigerator for up to two weeks.
Notes
I am someone who watches their sugar intake. I omit all of the sugar. The result is a tangy dressing. If you would like to use sugar in this recipe, you may use up to to 1 tablespoon of sugar. I would suggest that you make the dressing without sugar and then slowly add ½ teaspoon at a time until it tastes as you would like it to.