What sort of wretched food was the annexe family obliged to consume

From the text:

The food is wretched, and so are we. As of tomor- row, we won't have a scrap of fat, butter or margarine. We can't eat fried potatoes for breakfast (which we've been doing to save on bread), so we're having hot cereal instead, and because Mrs. van D. thinks we're starving, we bought some half-and-half. Lunch today consists of mashed potatoes and pickled kale. This explains the precautionary measure with the handkerchief. You wouldn't believe how much kale can stink when it's a few years old! The kitchen smells like a mixture of spoiled plums, rotten eggs and brine. Ugh, just the thought of having to eat that muck makes me want to throw up!