Add the avocado, garlic, basil, parsley, dill, scallions, salt, lemon juice, apple cider vinegar, and water to a high-speed blender or food processor. Blend on high until the mixture becomes creamy and smooth, with the herbs finely incorporated and the avocado fully puréed.
Pause to scrape down the sides of the blender or processor using a spatula to ensure all ingredients are evenly mixed. Resume blending, and with the machine running, slowly stream in the olive oil until the dressing emulsifies into a luscious, silky consistency.
This vibrant dressing is wonderfully versatile—use it as a salad drizzle, a flavorful dip, a sandwich spread, or a zesty sauce over roasted vegetables, grain bowls, or grilled plant-based proteins.