Chorizo is magic, pure culinary pixie dust. Just a bit of the stuff can render the humblest of ingredients magnificent. Here, the paprika and pork fat cook slowly into the potatoes and onions, infusing them with a subtle porky spice that makes the final dish much more than the sum of its parts. If you employ the slicing disk of the food processor to make quick work of the potatoes and onions, this dish requires little effort. And those 40 minutes the chorizo, potatoes, and onions are getting to know each other in the oven? Well, consider it aroma therapy. This dish keeps well in the fridge overnight. Your leftovers will be the envy of the office kitchen.