Spread bag of hash browns on griddle. Make a large rectangle and smash potatoes flat and thin. Cook about 8 minute till golden brown. Cut hash browns in 8 equal squares and cook the other side with rest of oil until crisp and golden brown.
When hash browns are done, add one slice swiss to each square.
grill sauerkraut until hot and spread on top of 4 squares.
Grill pastrami until hot and add on top of each hash brown squares with sauerkraut,.