01 -
Preheat oven to 350°F. Heat vegetable oil over medium heat in a heavy-bottomed ovenproof pan.
02 -
Add lamb shanks to pan and brown evenly on all sides until golden, ensuring proper spacing to achieve thorough browning.
03 -
Add halved onion and garlic cloves to the pan, cooking until fragrant and lightly softened, about 3 minutes.
04 -
Pour in red wine, stock, and tomato purée. Stir in brown sugar, bay leaves, and thyme. Increase heat to bring mixture to a simmer.
05 -
Cover pan with lid and transfer to oven. After 1 hour, reduce oven temperature to 300°F and continue braising for an additional 2 to 3 hours until meat is tender and falling off the bone.
06 -
Carefully remove lamb shanks and keep warm. Discard bay leaves and thyme sprigs. Transfer sauce to blender and puree until smooth.
07 -
Return sauce to pan, season with salt and pepper. Mix cornflour with cold water to form a slurry, gradually whisk into sauce and heat gently until thickened.
08 -
Serve lamb shanks alongside the thickened red wine sauce.