A toast sandwich is a sandwich made with two slices of bread in which the filling is a thin slice of heavily buttered toast. An 1861 recipe says to add salt, pepper and cumin to taste.
A recipe for toast sandwiches is included in the invalid cookery section of the 1861 Book of Household Management by Isabella Beeton, who adds, "This sandwich may be varied by adding a little pulled meat, or very fine slices of cold meat, to the toast, and in any of these forms will be found very tempting to the a...