Place all the ingredients in a food processor or blender.: The moment you start combining the avocado , cilantro , garlic , the creamy dairy, acid, and olive oil in the food processor or blender , you will notice the bright green color deepen and the aroma lift. Expect a fresh herbal scent from the cilantro , a faint garlic perfume, and the subtle fatty note from the avocado . This first step matters because it brings the ingredients into close contact so the blades can break down fibers and release oils, creating an even emulsion. A common mistake here is overloading with water or using an underripe avocado which yields a stringy texture, so aim for a ripe but firm avocado and add liquids gradually.
Process until smooth, stopping to scrape down the sides a few times. Thin the salad dressing out with about 1/3 cup water (give or take) until it reaches a desired consistency.: As the machine runs, watch the texture change from chunky to creamy, and listen for the blender to move smoothly without stalling. Scraping down the bowl with a spatula ensures no pockets of unblended herb or garlic remain, and that the emulsion is uniform. You should feel a silky, thick texture against the spatula. The why is simple, uneven blending yields bitter flecks or uneven seasoning; scraping prevents that. Avoid running the blender at excessively high speed the whole time, which can heat the mixture and dull the fresh flavors.
Keep in an airtight container for 1-2 weeks.: When you begin to add water, do it in small increments while watching the flow and viscosity. The dressing should glide off a spoon in a steady stream rather than cling like a paste. This is where sensory cues matter most, you will see the color lighten slightly and hear a quieter, smoother whirl as more liquid incorporates. Thinning affects how the dressing behaves on salads or bowls, so adjust based on use, adding water to pour over leaves or leaving it thicker for dipping. A frequent error is adding too much water at once which dilutes flavor, so add slowly and taste as you go.
Keep in an airtight container for 1-2 weeks.: Stored airtight in the fridge, the dressing will mellow and the flavors will integrate, producing a more rounded profile after several hours. You can expect a slightly denser texture the next day, and a refreshed brightness after a quick stir. This resting period also helps the acid preserve the color and slow browning of the avocado . A typical mistake is leaving it exposed to air which can accelerate discoloration, so press a piece of plastic directly on the surface or use a well sealed jar to maintain freshness.