A simple soup or broth of sodden bread scraps, seasoned with whatever is available. There is also a thicker sauce form of a brewis, see: Brewis Sauce

RD Blackmore's 1869 novel 'Lorna Doone' has "She can't stir a pot of brewis."


Original Receipt from A New System Of Domestic Cookery By 'A Lady' (Mrs. Maria Eliza Ketelby Rundell) (Rundell 1807)

RESPECTING THE POOR
A very good meal may be bestowed in a thing called Brewis, which is thus made: cut a very thick upper crust of bread and put it into the pot, Have salt beef boiling and near ready; it will attract some of the fat, and, when swelled out, will be no unpalatable dish to those who rarely taste meat.




Brewis
Image: foodsofengland.uk