Remove with a slotted spoon and keep aside. 3 Saute onions and Swordfish with Zucchini and Saffron By Fettuccine.Inn MAKING 1 In a saucepan melt the butter stir in the flour and cook over a low heat for 30 seconds. 2 Stir in the milk cook over a gentle heat stirring continuously until thickened and smooth. 3 Turn off the heat and beat in all the cheeses except the Parmesan.