how long to slow cook turkey
1 Place the turkey onto the rack, breast side up. 2  Cook the turkey uncovered in the oven at 500 degrees Fahrenheit for 15 to 20 minutes. 3  Reduce the heat to 200 degrees Fahrenheit (94 degrees Celsius) for slow cooking and cook for 40 to 50 minutes per lb.4  Let the roasted turkey rest for 20 to 30 minutes before carving.. Slow cook a turkey using the oven and a roasting pan. 1  Preheat the oven to 500 degrees Fahrenheit. 2  Clean the giblets out and rinse the bird, inside and out, under cool water. 3  Pat it dry. 4  Brush butter or olive oil all over the bird and cover with your favorite seasonings.