Typically, eggs in purgatory are eggs poached in a spicy tomato sauce. The method, which resembles shakshuka, will work with any pan sauce you feel like throwing together, as long as there’s enough liquid to make sure things get steamy. For a weeknight dinner, a can of beans adds protein, fiber, and creaminess, and the parsley salad is not only a resourceful way to use up herbs, but also adds some nice cold/hot, fresh/saucy contrast to the dish. If substituting harissa for the tomato paste, omit the crushed red pepper.