1. 1.slice onion in strips.
2. 2. Heat up pan and melt 2 tbls of butter.
3. 3. Place onions in pan with melted butter and stir watching that you don't burn the onion.
4. 4. Sprinkle sugar ontop of onions (helps with carmelization process) cook until translucent remove onions and butter and set to the side.
5. 5. In the same pan melt the other 2 tbls of butter when melted stir in flour ( it will clump)
6. 6 stir in milk and add cheese you may use more milk to thin cheese sauce.
7. 7. Turn off heat and set aside
8. 8 slice steak in thin strips.
9. 9 assemble sandwich steak, onions, cheese sauce.