Ingredients
White wine sauce
Method
1.Preheat oven to 180°C. Pat lamb dry and rub with salt and pepper. Make incisions between skin and flesh and insert rosemary leaves and garlic slivers.
2.Heat butter in an flameproof baking dish on medium. Cook onion for 5 minutes, until soft. Remove from heat, top onion with lamb. Pour over white wine and 1 cup water. Add bouquet garni and cover with foil or a lid.
3.Bake lamb for about 1 hour 15 minutes, removing foil for last 15 minutes, until tender. Place lamb on a heated serving platter, cover with foil and keep warm.
4.Strain liquid from dish and measure. Add enough stock to obtain 2 cups liquid.
5.To make white wine sauce, melt half of butter in a pan on low heat. Stir in flour and cook until pale. Stir in stock mixture. Cook for 5 minutes, until thick and glossy. Remove from heat and whisk in egg yolks. Return to heat and whisk until thick and almost boiling. Cut remaining butter into small pieces and gradually whisk into mixture. Remove from heat and stir in cream and parsley.
6.Carve lamb. Serve with white wine sauce and baby vegetables, if liked.