Preheat oven to 450°F.
Remove any giblets, neck or other pieces from inside the goose. Keep these to flavor homemade bone broth or make gravy later. Pull off and discard any visible pieces of fat. Rinse the bird all over with cold water and pat dry.
Prick the goose skin on the lower half of the breasts and on the thighs with a fork. These small holes allow fat to drain throughout cooking.
Place goose breast side up on a wire rack in a roasting pan.
Pull skin over the lower cavity and secure it in place with a skewer (or two).
Squeeze lemon juice over the whole bird, then salt lightly. Tie the legs together with the kitchen string.
Flip the bird over in the rack, breast-side down, and roast for 45 minutes to one hour at 450°F.
Every 30 minutes, use the basting bulb to siphon off the fat in the pan. You can reserve this fat for later uses (gravies, soups, etc). It freezes well in ice cube trays.
After 1 hour of cooking the goose, reduce the oven to 325°F and flip the goose breast-side up. Cook the goose for one more hour, checking for doneness with a roasting thermometer. The goose is done when the thickest part of the breast reaches 175°F. If the goose isn’t brown enough, turn the oven up to 400°F for the last 15 minutes of cooking.
Remove from the oven and allow the goose to rest for 20 minutes before carving.
To serve, slice the meat thin, discarding fat and unwanted skin as you go.