From Lynne Wilson
2 Tbsp. butter or margarine
2 Tbsp. flour
1 ¼ cups milk
1 cup medium sharp cheddar cheese, grated or diced
½ tsp. dry mustard
Salt and pepper to taste
Melt the butter in a 2-quart saucepan. Stir in the flour and cook over medium-low heat until bubbly. Stir in the milk and continue to cook, stirring, until it comes to a boil. Cook for 1 minute longer. Add the cheese, mustard, and salt and pepper and stir until the cheese melts. Pour over the cabbage rolls.