When I'm cooking parsnips i always par-boil them befor roasting,15 minutes on the boil and then into the oven with knob of butter for half hour remembering to baste them half way through .
Unstuffed
8 to 12 pounds 2 3/4 to 3 hours
12 to 14 pounds 3 to 3 3/4 hours
14 to 18 pounds 3 3/4 to 4 1/4 hours
18 to 20 pounds 4 1/4 to 4 1/2 hours
20 to 24 pounds 4 1/2 to 5 hours
Stuffed
8...