Potato Soup

1 lb potatoes, diced to make about 2 Cups (red potatoes are a great variation!)
1 1/4 tsp. salt
2 cup boiling water
1/4 cup butter
1/4 cup flour
2 cups milk
2 cups cheddar cheese
2 1/4 tsp. worcestershire sauce

Combine potatoes, salt and water in a medium pan. Bring to a boil, reduce heat and simmer, covered, until potatoes are done. Don't drain off liquid. In another medium pan, melt butter. Add flour. Cook over moderate heat, stirring a few minutes. Gradually add milk. Stir constantly, until thickened. Remove from heat. Add cheese. Stir until cheese melts. Add to potato mixture, then add worcestershire sauce. Heat to serving temparture only. Do not boil.