Thoroughly combine brown sugar, mustard and horseradish.
Moisten with just enough cola to make a smooth paste; reserve remaining cola.
Rub entire ham with mixture.
Place ham in crock pot and add remaining cola.
Cover and cook on high setting for 1 hour, then ..
MAKING
1) At the bottom of slow cooker put half of sliced onions.
2) Put Add meat, cloves, and water.
3) Place remaining sliced onions over it.
4) Cook covered on low for 8-12 hours.
5) Discard bone from meat.
6) Cut the meat and drain the liquid.
7) Place ..
