Drizzle olive oil into a wide frying pan set over medium (4/10 heat). Season the lamb pieces with a sprinkle of the kosher salt and pepper, then taking about one-quarter of the pieces at a time (so they fit in the frying pan in a single layer without crowding), sauté until lightly browned on all sides. Once each portion is browned, set off to the side in a heavy-bottomed, 4.5-6 quart Dutch oven**.
When all the lamb is browned and resting to the side in the Dutch oven, Preheat the oven to 325°F/160°C, adjusting the rack(s) to the bottom and middle. The rack in the middle of the oven needs enough room above it to hold the covered Dutch oven.
Add the tablespoon olive oil, diced onions, garlic, ground coriander to the frying pan (no need to clean it between lamb and onions). Stirring occasionally, cook over gentle heat until the onions soften, about 20 minutes. Add the sweet paprika, preserved lemon, honey, and chilies, and continue to stir over the heat another 1-2 minutes.
Pour the spiced onion mixture over the lamb pieces in the Dutch oven and stir well to distribute. Pour in the tomatoes, then the chicken broth*, using a little of the broth to "rinse out" the tomato cans of any clinging tomato stuck to the bottom. The meat should be just covered by the liquid. Add the cinnamon sticks and lemon juice, then stir carefully to combine.
Place the Dutch oven over high heat and bring the liquid to a boil. As soon as the liquid boils, cover the Dutch oven, then place it in the pre-heated oven. Cook for 2-2-½ hours, checking occasionally (every hour-ish) to ensure the meat is still covered by liquid and adding more chicken broth (or water) if it is not.
Remove the Dutch oven from the oven, remove the lid, and pour in the uncooked orzo pasta. Stir to combine, then return the pot to the oven (uncovered) for another 25 minutes, at which point the orzo should be very tender.
Ten to fifteen minutes after adding the orzo, slice the halloumi and fry it (you can use the same frying pan or a smaller one) until golden brown on both sides, about 5 minutes per side.
If necessary, add a little more chicken broth to the lamb bake to loosen up the sauce (I've never needed to do this, but it will depend on your Dutch oven size I think).
Serve the lamb baked with orzo immediately, with a couple slices of the sliced fried halloumi on top of each serving, along with green salad on the side.