Grate the block of cheese.
Preheat oven to 400 degrees.
Use food processor to dice up the roast beef into small pieces.
Preheat oil into frying pan.
Add onions and roast beef into pan.
Cook onions until they are soft and tender.
Add onions and beef to hoagie roll.
Top with habanero cheddar cheese.
Place cheesesteak into oven until cheese melts.