Eliza Acton gives several recipes in Modern Cookery for Private Families.
The first is for a "common cucumber sauce" is made by frying flour coated cucumber slices in butter until browned, optionally with onions, and making a sauce with brown gravy or beef broth.
Another version is made similar to gravy by stewing in butter until softened, seasoned with white pepper and stirred with flour and mixed parsley.
Alternately, the cucumbers can be boiled in seasoned veal gravy and mixed with egg yolks and an acidic ingredient like chili flavored vinegar or lemon juice to finish.
The white sauce is made by softening cucumbers in vinegar and water, simmering the softened cucumbers in seasoned veal broth and thickening the gravy with egg yolks before serving.