Combine above ingredients for pistachio crust into a chunky paste in bowl and set aside.
Prepare Leg of Lamb in roasting pan and rub thoroughly with pistachio crust. Let lamb rest at least 30 min - 1 hour to come to room temperature.
Preheat oven to 325 degrees. Roast Lamb about 17-20 minutes per pound, until internal temperature of meat is between 130 - 145 degrees. While cooking, combine all ingredients for parsley mint sauce in a food processor and process until blended. Serve sauce along side prepared lamb.
Take a look at our recommended pairings below.