547. Oysters.—Open and blanch delicately twelve middle-sized oysters, and put them in a stewpan with their own gravy, beard them, add a tablespoonful of milk or cream, and give it a boil, then add half an ounce of butter in which you have mixed a saltspoonful of flour, stir it in without breaking the oysters, put over the centre of your omelette, and proceed as before.