Preheat oil in deep fryer to 350 F
Lay egg roll wrapper sideways with one corner pointing towards you.
About 1/4 of the way up the egg roll wrapper, layer a small portion of shredded corned beef, followed by shredded swiss cheese and then shredded cabbage. Be careful not to overfill. Roll the wrapper carefully, tucking in sides midway through the roll. Seal edges with either water or an egg wash.
Start by frying just one egg roll at a time - submerge egg roll in preheated oil for 4-5 minutes, turning once during cook time.
Remove from oil and transfer to wire rack to drip off excess oil. Cut into egg roll to make sure it is fully cooked all the way through. If not, adjust your cook time slightly.
Fry remaining batch of egg rolls and serve with Thousand Island sauce or your favorite dipping sauce. Enjoy!