All of the roasts can be placed in the same pan; however, make sure there is good space in between them so the air can properly circulate. In terms of cooking time, you will just have to keep testing. The time will depend on your oven and how large each roast is. Have fun! Cheers!

Shopping at costco always look at the meat, there is one section where they sell all the prime cuts. Always pick a 6lbs boneless rib look at the price and put it down, The meat looks beautiful, My wifes b-day this week so I bought one. I don't think there"s any diff, in cooking it but just wanted to make sure.

Costco often sells some really good prime cuts of meat. If the label was prime rib and it is a well-marbled roast, you're good to go! Have a great dinner!

I am having 12-15 people over the 17th for corn beef and cabbage. Could you please tell me how many lbs. to buy and the best way to cook it. thanks, kathryn

There are many recipes for cooking corned beef and cabbage. In fact, if you search Rouxbe you will find one that is cooked in Guinness. Most recipes call for "boiling" the beef (braising); however, it can also be baked. Here is another recipe for one that is baked. And just for the heck of it, here's yet another recipe for you.

As for how much to cook per person, it does depend on what else you are serving and how much people eat. Figure about 1/2 lb per person of raw meat. I would say about 8 to 10 lbs. Of course, I err on the side of too much, rather than too little as leftover corned beef is awesome!

You may also want to brine the meat prior to cooking it. Also, depending on how you are going to serve it, you may also want to cook it ahead and then refrigerate it overnight. This will make it easier to slice, portion and serve the next day (as per the lesson in Pot Roasting).

Good luck and enjoy!