Cut a line down the center of the top of the lobster shell (not the underside of shell), stopping just before the tail fins. Pull shell apart leaving it intact, and gently pull lobster meat out, cradling it on top of the now opened shell. Using a sharp knife, make a small slit down the top of the meat and spread it by running your finger through the lobster meat. Fill crevice with butter, then sprinkle with garlic salt, pepper and paprika. Broil 3-4 inches from heat for approx 1 min per ounce. (ie: a 6 oz tail would take about 6 minutes). Watch carefully.