Assemble the ingredients for the rice step: strain the stock, get the shredded duck and diced enchidos to hand, and finely dice the onion and garlic.
In a large high-rimmed frying pan or dutch oven, add the duck fat and fry the enchidos (bacon, chouriço, and farinheira if you can find it) over a medium heat.
Add the diced onion to the pan and caramelise well at a medium-low heat for 10-12 minutes. Add the diced garlic, cook for 2-3 minutes, and add the rice to the pan.
Toast the uncooked rice in the pan at a medium-high heat for around 5-6 minutes, stirring constantly, raising and adjusting the heat where necessary so as not to burn or let the rice stick, until you achieve an even, golden-brown hue.
Once the rice is toasted, add the shredded duck, the strained duck stock (at a rice/stock ratio of 1:1.5), a few squeezes of orange, and cook at a medium simmer, covered, for 15-20 minutes. Check for seasoning before simmering, and adjust as necessary.
When the rice is almost tender, turn off the heat and let the pan rest with the lid on for a further 5-10 minutes.
Serve individual portions with more sliced (uncooked) chouriço and orange slices, if desired.