Wiktionary
n. A hearty traditional British meat soup of disputed origin.
Wikipedia
Brown Windsor soup is a British meat soup that is said by conventional wisdom to have been popular during the Victorian and Edwardian eras.
Usage examples of "brown windsor soup".
Given the nature of the hotel I'd expected the menu to feature items like brown Windsor soup and roast beef and Yorkshire pudding, but of course things have moved on in the hotel trade.
The colonel fixed the monocle to his good eye and began to read, occasionally looking up at Daphne, only to observe that she hadn't touched the Brown Windsor soup that had been placed in front of her.
Stephen Maturin had dined with the ladies of Mapes, Mrs Williams, Sophia, Cecilia and Frances - traces of brown windsor soup, codfish, pigeon pie, and baked custard could be seen on his neck-cloth, his snuff-coloured waistcoat and his drab breeches, for he was an untidy eater and he had lost his napkin before the first remove, in spite of Sophia's efforts at preserving it - and now he was sitting on one side of the fire drinking tea, white Sophia toasted him crumpets on the other, leaning forward over the pink and silver glow with particular attention neither to scorch the crumpet by holding it too close nor to parch it by holding it too .
I accepted with reluctance, not being greatly attracted to the sight of a lot of judges and publishers sitting together drinking Brown Windsor soup (the Sheridan was proud of its cuisine, less nursery food than old-fashioned railway dinners).