With its vivid green color and creamy texture, this dressing works wonderfully for robust lettuces such as iceberg, romaine, or radicchio. Thin with more oil or water if you prefer a lighter consistency.
Place the garlic, spinach, parsley, and scallions in the bowl of a food processor. Pulse repeatedly to grind the mixture.
Add the avocado and run the machine to purée.
Add the remaining ingredients and process until the dressing is smooth. Taste and adjust seasoning as desired.
Transfer the dressing to a clean container and refrigerate, covered, for up to 4 days.