Shrimp with feta, or garides saganaki, is a Greek classic. Adding orzo pasta and spinach to the combo, as we do here, yields a superb meal-in-one. Credit for the idea goes to chef Michael Psilakis and a recipe from his book, “How to Roast a Lamb.” Sear the shrimp and start the tomato sauce while the pasta water heats and the orzo cooks. We stir the spinach and feta into the orzo immediately after draining—the heat from the pasta melts the feta and gently wilts the greens. The orzo-spinach-feta mixture is fine to wait until the shrimp and sauce are finished and ready for tossing.