Strip all possible fat from the beaver. Preheat oven to 450 F, season with salt and pepper and place on a rack in the roaster. Cook at This high heat for 15 to 20 minutes to sear the outside, then lower the heat to 325 F to 350 F and roast for 30 minutes per pound. Slice an onion over the top of the roast if you wish. In contrast to the big game animals, This critter needs no basting -- the rack is advisable so that the fat still within the beaver will not collect around the roast itself. Some people like to roast carrots, onions, and pealed potatoes in with the beaver.