Using a blender or food processor, process pistachios into a purée. While blending, add garlic, cold water and Brandy. Process for 5 to 10 seconds, blending all ingredients together. With the food processor running, add the pistachio oil in a thin stream until all is incorporated. Allow the sauce to sit for one hour for the flavors to develop.
Creatively experiemnt by adding 1 teaspoon of orange or lemon zest for a little zing.
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