Melt one pound of butter in a double boiler. (If you don't have a double boiler this size, use a large kettle, but stir constantly so it will not stick or burn.) Stir in approximately 2 cups of flour until smooth. Add about 1/2 gallon milk, stir occasionally. Add 4 pounds of Mel-O-Bit or Velveeta cheese. If too thick, add more milk until it gets the consistency of fairly thin gravy. (One can canned milk is good, too.)

POTATOES: Cook about 25-30 pounds of potatoes until they are about 2/3 done, pour off the water and when cool enough, skin them and cut in 1 to 1 1/4 inches cubes. Grease roaster, put in the potatoes, pour the sauce on them and cook until the potatoes are done. After they are boiling, salt to taste, but add it slowly as it can't be removed. If an electric roaster is not available, one of equal size may be used in your oven. Each roaster will serve approximately 60 people.