Brown-Sugar Cured Turkey

This recipe comes from the 1997 Thanksgiving issue of Bon Appetit magazine. A friend recommended it, and I've made it a dozen times since then. Last year I thought I'd try something different and I used traditional poultry seasonings, but my husband said it wasn't sweet enough. There's nothing better than crispy, sweet, salty turkey skin.

20 lb-turkey
1/2 cup packed brown sugar
1/4 cup kosher salt
2 tsp onion powder
2 tsp garlic powder
1 tsp ground allspice
1 tsp ground cloves
1 tsp ground mace
2 large onions, quartered
2 cups chicken broth

Rinse the turkey and pat dry with paper towels.
Mix all dry ingredients in a bowl. Rub onto turkey. Refrigerate 24 hours.
Preheat oven to 325 degrees.
Place turkey on top of onions; tie legs and tuck wings.
Sprinkle with pepper; cover loosely with foil.
Roast turkey 1 1/2 hours. Uncover; roast 30 minutes.
Baste with 1 cup chicken broth. Roast another hour, continuing to baste every 20 minutes.
Add the other cup of chicken broth; continue basting 1 more hour.
Check the temperature. If it isn't done, loosely cover with foil and continue to cook.
Let sit with foil tent for 30 minutes.