Recipe: To Dress Cucumbers Raw

They should be as fresh from the vine as possible, few vegetables being more unwholesome when long gathered. As soon as they are brought in lay them in cold water. Just before they are to go to table take them out, pare them and slice them into a pan of fresh cold water. When they are all sliced, transfer them to a deep dish, season them with a little salt and black pepper, and pour over them some of the best vinegar, to which you may add a little SALAD oil. You may mix with them a small quantity of sliced onion; not to be eaten, but to communicate a slight flavour of onion to the vinegar.

Directions for Cookery, In Its Various Branches.
Ladies and Professional Cooks.
Containing
The Whole Science and Art of Preparing Human Food. (Year 1840)