Clean calamari body. Remove tentacles and fins (if needed, I purchased mine with just the body shell). In mixing bowl, avocado, egg, spices salt and pepper. Stuff calamari with mixture. Close each end with a toothpick. In roasting pan, place squid and pour over marinara sauce. Cover pan with foil, bake in a preheated 350 degree oven for 30 minutes. Remove from the oven and serve.