One day before roasting: In a plastic container large enough to hold the ham, stir the water with the salt and brown sugar until dissolved. Add the spices. Score ham in a diamond pattern through the skin and fat, taking care not to cut into the meat. Add ham to brine, weight it with a plate to keep it submerged, and refrigerate for at least 4 but no more than 8 hours. Drain, rinse, pat the ham dry, and refrigerate.
One hour before roasting, remove the ham from the refrigerator. Preheat the oven to 450 degrees F. For the rub: Pulse the olive oil, mustard, parsley, sage, garlic, red pepper, salt, and black pepper in a food processor to make a paste. Rub it all over ham. In a large roasting pan, toss the onion wedges with 1 cup of the apple cider, and set the ham on top. Roast the ham for 30 minutes, reduce the oven temperature 325 degrees F, and roast until an instant-read thermometer inserted into the thickest part registers 165 degrees F, about 4 hours. After the first hour, loosely wrap aluminum foil around the bone to keep it from burning.
Meanwhile, for the glaze: Boil, then simmer, the remaining apple cider in a saucepan, skimming as needed, until syrupy and reduced to about 2 cups, about 1 1/2 hours.
During the last 1 1/2 hours of cooking the ham, brush it with the glaze every 30 minutes. Transfer the cooked ham to an ovenproof platter and let it rest in the turned-off oven for 30 minutes. Loosely cover the onions in a bowl, and put them in the oven as well. Strain the pan juices into a saucepan, skim off any excess fat, and bring to a boil. Make a paste with the flour and butter and whisk a bit at a time into the juices. Boil until thick. Carve the ham and serve with the onions and sauce.
By entering your email address, you agree to our Terms of Use
and acknowledge the Privacy Policy.
Food Network and
its affiliates
may use your email address to provide updates, ads, and offers.
To withdraw your consent or learn more about your rights, see the
Privacy Policy.