large tin of corned beef
2 onions chopped
4 carrots diced
5 large potatoes diced
dash of tomato ketchup or brown sauce
put all the above in large pan with water, not too much, you can always add more if its too thick.
cook on low heat for about an hour at least, keep stirring so that the potatoes break up a bit and makes the gravy thicker.
even better if you have a slow cooker,(which are fantastic for all in one meals) put the contents of the hot hash into the cooker on low and leave it all day. even if you go to work.
this will make more than enough for 2