Ingredients 225 ml milk 1 tblsp butter 1 tblsp plain flour, sieved. 2 tblsp fresh parsley, roughly chopped Salt and freshly ground black pepper. Method Pour the milk into a saucepan and add the butter and sieved flour. Slowly bring to the boil whisking continuously. When the sauce thickens turn the heat down to very low and season. Then whisk in the chopped parsley. Simmer very gently for 8 minutes stirring regularly. Serve immediately.