Pesto di Pistacchio (Pistachio Pesto) -- The rich flavor of pistachio is balanced with lemon zest in this bright-tasting sauce. Pistachio pesto is rather sweet, making it great with roasted vegetables.
Place arugula in the bowl of a food processor or blender. Add olive oil, pistachios, garlic, and red pepper flakes. Pulse until smooth, about 30 seconds. Season to taste with salt and pepper. Use immediately or store, refrigerated in an airtight container, for 1 day. Bring to room temperature before serving.