Heat oven to 350ºF (176ºC) with rack set in middle position. Arrange pistachios in a single layer on baking sheet. Toast until fragrant and starting to brown, 6–8 minutes. Transfer toasted pistachios to a mini food processor and let cool.
Add coriander seeds, cumin seeds and sesame seeds to now empty baking sheet. Toast until fragrant and starting to brown, 5–8 minutes. Transfer toasted spices to food processor and let cool completely.
Pulse nuts and spices until coarsely chopped, about 10 pulses. Add oregano, sumac and salt and pulse just to combine, about 5 pulses.
Store in an airtight container at room temperature for up to 1 month. For longer storage, store in the refrigerator or freezer for a few months. If you don't have a mini food processor, you can also use a mortar and pestle.
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