I am cooking one of those behemoth Costco pork shoulders for the Super Bowl tomorrow. As you may know, the package contains two "roasts", not even sure if it is from the same pig. The total weight for the entire package was 15.5 lbs. If I had to guess, one roast was 6.5 the other 8.5 (or so). I am going to cook them in the oven. According to one website, a good rule of thumb for cooking time to get the internal temp to 190 is 1.5 lbs/hour. SO, the question is do I cook for a 15.5 roast or a 8.5 roast? How will the separate "roasts" cook? This is a huge difference as I will have to cook it for 23 hours (15.5 * 1.5) or 12.75 hours. (8.5 * 1.5).
Thanks for the help!