Wipe the meat with kitchen paper and season lightly. Melt the butter in
a saucepan. Add the onion and mushrooms and fry (sauté),
stirring for 2 minutes.
Mash in the liver sausage
and the rice. Add the rosemary and a little salt
and pepper. Mix in the beaten egg to bind.
Sandwich
the breasts of lamb together in pairs with this
mixture. Sew up with a trussing needle and string or
secure all round with skewers.
Place in a roasting
tin (pan). Cover with foil or a lid and roast for 1
hour at 190°C/375°F/gas mark 5.
Half-way through
cooking, remove the cover, brush all over with half
the redcurrant jelly and cook uncovered for the
remaining time.
Transfer to a warmed carving dish
and keep warm. Spoon off all but 30 ml/2 tbsp of
the fat in the pan. Stir
in the flour and cook for 1 minute.
Blend in the
stock, bring to the boil and cook for 2 minutes,
stirring and scraping up any sediment in the tin.
Stir in the remaining redcurrant jelly and season
to taste.
Strain into a gravy boat. Carve the meat
into 6 thick slices, discarding string or skewers.
Serve hot with the gravy.