Croquettes must have been really fashionable dishes to serve back in the thirties. I have over 40 cook books from that era and almost every one of them have a recipe for some kind of croquettes. Salmon, ham, chicken, cod, rice, you name it, croquettes were made.
Leave out the ham and you might have a nice vegetarian dish here depending on how vegetarian your diet is. There are eggs and cheese here as well and if you leave those out too there isn’t much left to set your teeth into –Ted 😉