I do this quite frequently it is super easy and makes great meat.  I have started with my meat frozen and thawed.  If you start with thawed meat it will cook faster.  It is a great feeling to prepare the food in the morning knowing that supper will be ready and waiting.

I put onions, potatoes and carrots in the bottom, meat on top.

Make sure you season your meat well.
Choose a marinade, if you have my cookbook there are two in there.  Then pour your marinade over the top. 

Cook low and slow….8-10 hours.

I used beef chuck roast, but you could use venison or pork.

Also, this can usually make for multiple meals, at least two.  I usually use the roast for one meal and then make Beefy Noodes, Teriyaki Beef  or Beef Stew.