Melt butter in a medium saucepan over low heat; add flour and salt, stirring until smooth. Cook 1 minute, stirring constantly. Gradually add 1 cup milk; cook over medium heat, stirring constantly, until mixture is thickened and bubbly. Gently fold in flaked tuna, and continue cooking until mixture is thoroughly heated. Serve warm over toast points.
Oxmoor House Homestyle Recipes