1. Place the vegetable oil and lamb shanks in a large frying pan and fry over a medium heat for 8-10 minutes, turning occasionally to ensure browning on all sides.
2. Place lamb shanks, sliced onions, Patak’s Rogan Josh Paste, Tomatoes and stock into the slow cooker.
3. Turn on the slow cooker and cook on low for 8 hours.
4. Add the cherry tomatoes 20 minutes prior to serving.
Serve with roasted root vegetables and garnish with freshly chopped coriander.