Feast of the Day, 30 April

I find it interesting that my notes these days actually say things like, "Feast of the Day!" or, lately, "possible Feast of the Day, unless a better one comes". The notes are practically little blog posts in and of themselves, just on paper. The Feast of the Day for the 30th (sorry, I'm posting it a day late) is one of these:
"A dull, but possible, Feast of the Day, p. 166: 'there was soup, two vegetables, cream sauce and gravy, salad, salad-dressing, muffins, cocoa and dessert.' What's the gravy for?"
A day later, I still can't suss this out. No meat is mentioned. I think it's insanely old-fashioned (but then, so is this 20s book), but possible, that these girls put cream sauce on their vegetables. That still leaves the gravy, which is for - what, the muffins? If they were biscuits, I could almost see that; "biscuits and gravy" is an established pairing. But as is, it's an odd addition to the menu.