5 lbs roast beef (3-5 lbs.) any cut will do
garlic, slivers
onion, slivers
1 cup cider vinegar (or white vinegar)
2 cups strong brewed coffee
2 cups water
salt and pepper

With a sharp knife, cut slits all the way through the roast and insert slivers of onions and garlic.
Put the meat into a bowl and slowly pour the vinegar over it so that it runs down the sides into the slits.
Cover with plastic wrap and refrigerate for 24-48 hours.
When ready to cook, pour the vinegar off.
Place the meat in a heavy dutch oven and brown in oil until very dark on all sides.
Pour the 2 cups of brewed coffee over the meat and then add 2 cups of water.
Cover and cook slowly for approximately 6 hours on top of the stove.
You may need to add more water at some point, so check it once in a while and add only a small amount of water at a time.
Season well, but do not add the salt and pepper until about 20 minutes before serving.

This was the most tender roast I have ever cooked. It just falls apart on you.