Blend these together in the top of the double boiler.
Add milk all at once to butter/flour mixture; stir until homogeneous.
Transfer top of double boiler to direct heat and stir the mixture until it has thicked somewhat. Then return top of double boiler to its pan.
Add about 1/3 cup of grated cheddar cheese; flavor is enhanced if the cheese block is allowed to fall into the white sauce.Conversion to Glop
Serve over toasted, sliced, and diced Dr. Orgo's Sourdough Bread.