
Make the Zhoug: You can make the Zhoug up to two weeks in advance and store it in the fridge in an airtight container.
Blanch the spinach and dry well. Fill a medium saucepan about three quarters of the way with water. Prepare a large bowl filled with ice water. Bring the water in the pan to a boil and add the spinach. Cook just until wilted, about a minute, then transfer the spinach to the ice water until it’s thoroughly chilled. Drain very well and squeeze the spinach as dry as possible.
Crush the pistachios. Add the pistachios to the bowl of a small food processor fitted with an S blade. Close the lid and run the processor until the pistachios are finely chopped. Remove about 3 tablespoons of crushed pistachios and set aside for garnish.
Make the dip. To the food processor with the crushed pistachios, add the blanched spinach, Greek yogurt, garlic, aleppo pepper, lemon zest, and a pinch each of kosher salt and black pepper. Close the lid and run the food processor until the mixture is thick and creamy.
Finish and serve. Transfer to a serving bowl and top with zhoug and the reserved crushed pistachios. Serve with pita chips or your favorite crackers.