This reminds me of a passage in a 19th-century American children's book, _Mr. Rutherford's Children_: "But in trimming the orange dress Miss Mantilla's fancy took a turn, and so did the green braid—many a one; till Chryssa's little frock looked much more fanciful and complicated than herself, and seemed almost like a uniform in the service of that gay Dahlia, 'the King of the Yellows.' One of the ladies in the hotel said it looked like spinach and eggs—but what if it did ? Chryssa could make out nothing against it on that score ; and though the dark red dress was her favourite, she thought the orange frock very pretty and still more wonderful."

All the contemporary recipes I can find say that "spinach and eggs" means poached eggs on a bed of spinach, but everything I find saying that something else looks like spinach and eggs suggests them mixed together in a streaky fashion.