Remove the skin and most of the fat from the surface
of the meat, leaving just a thin, even layer of fat.
Cut away the meat from the top 3.5 cm/1 1/2 inches of
the rib ends and scrape them well.
Using a sharp
knife, score the surface of the fat in a diamond
pattern.
Grate 250 g/8 oz of the courgettes by hand or
in a food processor and mix with the sweet corn,
breadcrumbs, orange rind and Quark or other soft
cheese. Season the mixture with salt and pepper.
Shape the mixture into a long roll and place this
along the curve of the bones of one joint; place the
other joint over the first so that the bones
interlock, forming 'crossed swords'.
Fasten them
firmly with string and wrap the tops of the bones
with pieces of foil to prevent them from burning.
Place the joint on a rack in a roasting tin.
Roast
in a preheated oven, 180°C
(350°F), Gas Mark 4, for 1 1/4 hours until the lamb is just tender and still
slightly pink in the centre.
Meanwhile, cut the remaining courgettes into long
sticks about the size of the baby corn cobs. Place
the courgettes and corn cobs in a pan with the oil
and the orange juice.
Sprinkle them with pepper and
cover the pan tightly. Cook over a fairly high heat,
shaking the pan occasionally, until the vegetables
are just tender.
Remove the meat from the oven and
skim any fat from the juices. Place the meat in the
centre of a warmed platter and arrange the
vegetables around it.
Garnish with sprigs of
rosemary. Mix the cooking juices and serve
separately as a sauce.