Melt butter in sauce pan over low heat, add flour and salt and stir until well blended. Add the milk gradually, stirring continuously until smooth. Cook until thick. Serve hot with sugar, butter and cinnamon. Pour a little milk around edges of porridge in bowl.
Or: velvet porridge (Floisgrod) almost the same but with 3 pints milk, 3/4 cup butter, 2 cups flour, 1/2 cup water and salt. These are very similar to Rommegrot which is sweet like a dessert, with sugar and cinnamon on top.