To a blender or food processor at the pitted and peel avocado, fresh parsley, ¼ cup water, olive oil, lemon juice, lemon zest, garlic, salt, and black pepper.
Blend until smooth. Scrape down the sides of the blender and add additional water, 1 tablespoon at a time, as needed.
Adjust to taste, such as adding honey or increasing salt, lemon juice, etc. Store leftover dressing in the fridge for up to 4 days.
Notes
One medium to large avocado, or two small avocados, typically yield about ½ cup of avocado. It's okay if the amount is more or less than ½ cup, just adjust the water amount accordingly.
Makes about 1 cup (8 ounces) of dressing. One serving is about ¼ cup.
For a great taco salad dressing, use cilantro in place of parsley and lime juice and zest in place of lemon.
Also works with fresh basil, chives, green onions, and dill. Add additional water or lemon juice to thin, as needed.