Why buy it in a box? Serve this hearty, healthy homemade version for supper tonight.
1 Preheat the oven to 180 °C.
2 WHITE SAUCE Heat the butter in a saucepan and stir in the flour to form a paste. Stir for 1 minute, add the milk and beat with a hand mixer to create a thick, smooth sauce. Season with salt, pepper and the mustard powder. Reduce the heat and simmer for about 3 minutes or until done. Cover the sauce with clingfilm.