Thaw spinach in refrigerator overnight. Place thawed spinach in a lint free tea towel and wring out as much liquid as possible.
Place all ingredients in the bowl of a food processor breaking the spinach into chunks as you add it. Pulse until combined. Scrape down the edge of the bowl and process again about 30 seconds until well blended, but not completely smooth. Transfer to a serving bowl and cover. Chill 30 minutes to 1 hour to allow the flavors to blend.
Serve with sliced cucumber, crudités, or pita chips.