For the meat:
Place the carrots, half an onion, garlic, celery and meat in a baking dish. Season with salt and pepper and add a glass of good aromatic white wine.
Bake at 180 ° for about an hour, then cover the pan with aluminium foil and bake again at 165 ° for 3 hours.
Remove from the oven, allow to cool and debone the meat. Remove the hard fatty parts and the garlic. Collect the vegetables which, together with the meat, will be used for the filling.
Set aside the lamb bones, which will be used for the sauce.