Roast beef "like they do it in Santa Fe" (Slideshow version)
Stage 7/7 : 5 hours
After this long cooking, you will see that the meat has given off wonderful juices, full of flavour and with very little fat - a feature of slow cooking.
Tip out the contents of the bag into the serving dish and discard the flavouring ingredients. Serve without delay with the your choice of side dishes.
If you will not be serving the roast right away, put it back in the oven to keep hot.
Remarks
This is an opportunity to use a cheaper cut of meat. Even if it seems a bit tough or stringy, the magic of long slow cooking will transform all that (there's no need to go for sirloin or another expensive cut). Ask your butcher for "braising" or "stewing" beef; a good butcher will be able to advise you. If not, opt for cuts like chuck, flank, brisket, etc.