Method
Preheat the oven to 220°C, 200°C fan
Put the lamb or hogget in a large roasting tin. Rub it with olive oil and season well with salt and pepper. Place it in the oven and roast for 30 to 35 minutes
Remove from the oven, add the onions, lavender and thyme to the tray along with a splash of water. Turn the oven down to 180°C, 160°C fan and return to the oven. Roast for a further 1½ to 2 hours, depending on how pink you like it, basting well from time to time
Remove from the oven and allow to rest in a warm place for at least 20 minutes
Lift the onions from the tray and keep warm in a serving dish, discard the lavender
To make the gravy, set the roasting tray over a medium heat. Scatter the flour over the roasting fat and juices and work it in with a wooden spoon. Cook gently for 1 to 2 minutes, then add the warm stock. Stir well, the sauce will begin to thicken as it comes back to the simmer. Simmer for 2 to 3 minutes, then season to taste with salt and pepper. Pass the gravy through a sieve and keep warm in a clean pan
Serve with the gravy alongside potatoes and seasonal vegetables