Start by marinating the chicken. In a bowl, combine the lemon juice, garlic, grated ginger, cumin, saffron threads, olive oil, salt, and chopped onion. Mix well until the marinade is evenly blended.
Place the chicken pieces in the marinade, ensuring they are fully coated. Cover the bowl and refrigerate for at least 2 hours, allowing the flavors to penetrate the meat.
Preheat your oven to 325°F (165°C). While the oven is heating, remove the chicken from the refrigerator and let it come to room temperature.
Heat a large, oven-safe pot or tangia pot on the stovetop over medium heat. Add a drizzle of olive oil and sear the chicken pieces until they are golden brown on all sides. This step will help seal in the juices and add depth of flavor.
Once the chicken is seared, add the preserved lemons and any remaining marinade to the pot. Cover the pot tightly with a lid or tin foil, ensuring a tight seal to trap the steam and flavors.
Place the pot in the preheated oven and let the chicken cook for about 3 to 3 ½ hours, or until the meat is tender. The slow cooking process allows the flavors to meld together beautifully, resulting in a rich and aromatic dish.
Once cooked, remove the pot from the oven and let it rest for a few minutes before serving. This allows the juices to redistribute, ensuring a moist and succulent chicken.