Place the cilantro, toasted nuts, garlic, and lime juice into a compact blender or food processor. (For larger blenders, consider doubling the recipe amounts for better consistency.)
Pulse until the mixture is roughly combined. Use a spatula to scrape down the sides occasionally, as the texture is naturally a bit thick.
Slowly drizzle in the olive oil while blending. If you notice the mixture is resisting the blades, add a splash of water to help it along.
Season with salt and pepper, taste, and adjust as needed. Enjoy your refreshing twist on pesto as a dip, sauce, or dressing!