In a bow,combine all the ingredients, seasoning to taste with salt and pepper, and refrigerate until firm, about 1 hour.
To assemble
Cut the pastry sheets into two 23x20cm rectangles, reserving leftover pastry for decoration. Shape filling into 2 loaves and place on centre of each pastry rectangle. Brush edges of pastry with egg yolk and roll pastry around filling, sealing the edges and tucking under to seal well. Place loaves seam-side down on a lightly greased baking tray. Cut leaves for decoration from remaining pastry and attach to loaves with egg yolk. Bake in a hot oven (200 degrees) for 25 minutes.
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