Geneva Sauce, Brown — Cataldi's “Sauce Genévoise” for Salmon or Grilse or Salmon Peel.
(“Sir John's favourite brown sauce.”)
Take a tumbler of port wine and put it into a stewpan with a little thyme, 1 bay-leaf, and 1 onion. Let it cook till reduced to glaze; then add to it about 8 tablespoonfuls of Spanish Sauce (see Sauces for Meat). Let it boil for about 5 minutes; pass it through a tammy; season, and serve over and round the sliced salmon.
(The above is enough for 12 people—but for 4 people a wine-glassful of port wine to 3 tablespoonfuls of Spanish sauce is quite enough.)