27. BRETONNE SAUCE.
CUT two large onions into thin slices; fry them of a light brown colour, in a little butter; then add sufficient brown sauce, according to the quantity required, a little consommé, and a pinch of pepper; boil the sauce gently for a quarter of an hour, and then pass it, as you would a purée, through the tammy, and put it into a bain-marie for use.