MIX spinach, parsley, water, onions and tarragon in small saucepan. Bring to boil. Reduce heat to low; cover. Simmer 1 min. Drain.
PLACE spinach mixture and all remaining ingredients in blender or food processor; cover. Blend until smooth. Cover. Refrigerate several hours or overnight.
SERVE with assorted cut-up fresh vegetable dippers.
