Délices au Gruyère

• 4 tablespoons butter
• flour
• ¾ pint boiling milk

Melt butter in the top of a double saucepan; stir in 4 tablespoons flour and cook over water, stirring continuously with a wooden spoon, until smooth. Pour in boiling milk and mix with a whisk to make a thick sauce.

Simmer sauce for a few minutes longer; add grated Gruyère and