no real secret for canning ..the canned stuff was just smoked for 1 hour with hickory an the lowest temp I could get with my smoker (140deg). 1/2 pint jars, add tuna chunk trying to fill the voids to about 1 inch from top, we then added 1/8 tsp salt and 1tbs veg.oil. clean the rims and put on lids and rings(finger tight), pack them in the pressure cooker with about 2-3 inches water, cook under pressure of 10-11 for 100 minutes beginning the time when you get up to 10lbs pressure. The smoked stuff I used 1 large can of pineapple juice, 2 cups brown sugar, 1 cup salt, 1 cup terriyaki marinade, cut loins into chunks smaller than a tennis ball and I soaked them in the brine for 1 hour turning after 1/2 hour. I smoke this with alder chips until flakey . turrned out nice and moist...