Cod Croquettes

Cook minced onion slowly in 2 tablespoons olive oil in a saucepan. When onion is golden, add cod squeezed of liquid and cut into small pieces. After all remaining liquid has cooked out, stir in chopped parsley and 4 rounded tablespoons flour. When mixture is entirely dry, remove from stove and stir with a wooden spoon while gradually adding 1 1/2 cups cold milk. Return pan to fire and cook over moderate heat 20 to 30 minutes until there is no taste of raw flour and mixture is a thick paste. You will have to stir more and more frequently to prevent sticking as the paste