In the third form, if the condition is true, then the first set of commands is performed. If the condition is false, and if the second condition is true, then the second set of commands is performed.
Roast your pork shoulder in the oven at 350 degrees F for 30 to 35 minutes per pound for a nice slicing roast. At this temperature, a 6-pound pork shoulder will require 3 to 3 1/2 hours to roast. Check for doneness by placing a meat thermometer into the roast at the thickest point. Be careful not to touch the bone.
You can also preheat your oven to 500 degrees Fahrenheit before you place the lamb shoulder in the oven. Then, turn it down to 325 degrees right when you stick it in the oven. It will brown and turn crisp, and then you can cook it covered for the remaining four hours.