Preheat oven to 350 degrees. Grind up pistachios in food processor or vitamix so that there is some variance in the texture of the nuts (i.e., some of it should be finely ground, and a little should be more coarsely ground). Remove ground pistachios from blender and put in bowl. Add celery salt, cardamon, coriander, onion powder, fresh cracked pepper, and 2 tablespoons of olive oil. Salt salmon filets and then coat them with the pistachio mixture. Place salmon in an oiled cast iron skillet or baking pan skin side down. Bake in oven for 30 minutes, checking on it every 10 minutes. If you notice it starting to burn on top (pistachios are very delicate), cover the pan with aluminum foil for the remainder of the time. Remove from oven, garnish with lemon and enjoy!