•  1 ounce butter.
•  1 ounce flour.
•  1 gill water.
•  Pepper and salt to taste.

Melt the butter in a small Saucepan, and when dissolved shake in the flour, stirring all the time until the paste is quite smooth; add a little salt and pepper, and then pour in gradually the water and vinegar; stir well until the Sauce has boiled for a few minutes. It will then be quite ready.

New Vegetarian Dishes, by Mrs. Bowdich (Year 1892)