Rub the salt beef dry mix onto the beef, place in the oven 2 -3 hours
Place the onions in a hot pan, fry until softened
Add the balsamic and honey and cook until thick and syrupy
Pull the salted beef apart
Build your sandwiches - Beef, caramelised onions and cheese.
Butter the outer sides of the bread and place in a moderately hot pan for a few minutes each side until golden brown