1) Preheat the oven to 350°F.
2) Clean the scallops, pat them dry and place them back in their shell.
3) In a bowl mix chopped pistachios, butter, chives, mustard, garlic and salt, until you get a thick paste.
4) Add about 1 tsp of the pistachio butter on top of each scallop and cook for 10 minutes in the oven.
5) ***This recipe also works for frozen or fresh scallops without the shells. First, sear the scallops in a nonstick skillet over high heat (about 2 minutes per side) and add the butter. Cook until the butter is completely melted and the pistachios start to turn crusty brown. Enjoy!