Pour the all ingredients, minus the pistachios, into a blender. Cover and blend until mostly smooth. Pour into twelve 3-ounce popsicle molds, or small paper cups.
Freeze for one hour. Then push a popsicle stick into the center of each pop, sprinkle with pistachios, and press gently.
Place back in the freezer until solid. To loosen, place the mold up-side-down under warm running tap water.