Heat a dash of oil in a large heavy based frying pan over a medium-high heat. Dust lamb shanks with seasoned flour then brown all over. Transfer to a casserole dish. (If you have a casserole dish that can go from stovetop-to-oven, then use that).
Lower the heat and add the onion and cook until just soft, 5-7 minutes. Add spices, chilli and lemon rind and cook until aromatic, about 1 minute.
Add vegetable stock, tomatoes, capsicum, tomato paste, Worcestershire sauce and brown sugar. Bring to the boil, season and pour over the lamb shanks. The liquid should just cover the lamb shanks. Place on a tight fitting lid and place in the oven to cook for 2 hours. After an hour, slice garlic bulbs in half horizontally and place in a piece of foil. Drizzle with a little oil then wrap up tightly. Place in the oven beside the lamb shanks and roast until the cloves are very soft.
Remove lamb shanks from the oven and add the orzo. Return to the oven and cook for a further half hour. The orzo should be al dente and the meat almost falling off the bone.
To serve, give each person a half of roasted garlic to squeeze over their lamb shanks.
Slow Cooker Optional Instructions
Place all ingredients except orzo in the slow cooker and cook on low for 8-9 hours (or high for 4 - 4 1/2 hours).
Cook orzo separately and add before serving.
As an excellent source of protein, this dish is perfect for muscle recovery after a workout, and for growing children.
Char-grilled red capsicums can be bought in jars from your supermarket and are perfect to use in winter when fresh capsicums are out of season.