In a bowl add hot water .then add alum and mix it
Potato socked in hot water for 30 mints
Then strain water and part a dry
Heat oil in a large skillet over medium-high heat. ...
Melt the butter in a saucepan.
Stir in the flour and cook for 1-2 minutes.
Gradually stir in the milk to get a smooth sauce.
Cook and stir until mixture thickens, about 3 minutes. Add Cheddar cheese and stir until cheese is melted, about 3 minutes more. Season with salt and pepper.