Cut the meat into large chunks.
Heat 2 tbsp of cooking oil in a large iron cast skillet.
Brown the chunks of meat on each side. Do it in batches to not overcrowd the skillet. Transfer to a plate.
Deglaze the skillet with chicken stock. Scrape the brown bits off the sides and stir them in. Simmer to reduce.
Add the ginger, garlic and chili pepper (if using) and cook for 2 minutes until aromatic.
Add the crushed or chopped tomatoes and stir in 1 tbsp of hawaij blend and 1 tsp of salt.
Return the chunks of meat to the skillet with the sauce. Cover and send into the oven at 170C for 2.5 hours.
Check the stew every 40-45 minutes. If the liquid boils out, add a little hot water.
Continue braising until the meat is almost falling apart. Add the potatoes and send back to the oven.
Cook for another 25-30 minutes until the potatoes are ready.
To serve, top with some zhoug sauce or drizzle over 2 tsp of lemon juice and garnish with fresh coriander leaves.