Put two tablespoonfuls of the butter in the frying-pan. Season the cutlets with salt and pepper, and when the butter is hot, put them in it. Fry gently for five minutes, if lamb or mutton, but if veal, put a cover on the pan, and fry very slowly for fifteen minutes. Set away to cool.
Put the remainder of the butter in a small frying-pan, and when hot, stir in the flour. Cook one minute, stirring all the time, and being careful not to brown. Stir in the cream. Have the ham, the yolks of eggs and the onion and lemon juice beaten together. Stir this mixture into the boiling sauce. Stir for about one minute, and remove from the fire. Season well with pepper and salt.
Dip the cutlets in this sauce, being careful to cover every part, and set away to cool. When cold, dip them in beaten egg and in bread crumbs. Fry in boiling fat for one minute. Arrange them in a circle on a hot dish, and have green peas in the centre and cream sauce poured around.