Lamm i skorpa med rödvinbärssås

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1. 1
   Season the lamb well. Heat the oil in a frying pan and fry three fillets over a high heat for 5 minutes until seared on the outside. Remove from the pan and repeat with the other 3 fillets. Set aside until cold.
2. 2
   Unravel the whole pack of pastry on a floured surface and cut into four rectangles. Cut the half pack to make two rectangles. Roll out each piece to make the rectangles 2.5cm larger all round.
3. 3
   Position one rectangle with a short side facing you, brush with egg yolk and sprinkle with a sixth of the chopped sage. Put a lamb fillet on the pastry close to the end facing you, then fold the long sides in to cover the ends of the meat; brush these with more egg yolk.
4. 4
   Freeze the lamb parcels on a tray until solid for 4 hours, then pack in a freezer container. Seal, label and freeze for up to a month.
5. 5
   To make the sauce, melt the redcurrant jelly in a pan over a gentle heat, add the port and rosemary and boil uncovered for 10-12 minutes until syrupy. Cool for 5 minutes, strain into a freezer container, then leave until completely cold. Seal, label and freeze for up to a month.
6. 6
   On the day defrost the lamb seam-side down on a wire rack for 3 hours at room temperature. Defrost the sauce at room temperature.
7. 7
   Preheat the oven to fan 200C/ conventional 220C/gas 7. Put the parcels seam-side down on a nonstick baking sheet, brush with egg yolk, then snip four incisions in the top of each. Bake for 25 minutes until golden. Remove from the oven and rest them for 5-10 minutes. Reheat the sauce in a pan.
8. 8
   Slice each parcel and serve with the sauce and watercress salad.