Quick-bake raspberry rolls (Kopie)

*****
(makes six, double recipe for 12)

One sheet puff pastry, defrosted according to package instructions
1/4 - 1/2 cup raspberry jam, heated to loosen it (strain seeds if desired but I like them)
Scant handful dried cranberries
1/4 cup chopped walnuts
Melted butter for basting
Granulated sugar and sanding sugar for dusting

Preheat oven to 400 degrees F. Place defrosted pastry on a lightly floured surface. Lightly dust with granulated sugar. Brush with butter and use a fork to prick pastry in 4 or 5 different places. Spoon on and evenly distribute jam. Scatter walnuts and cranberries on top. Cut pastry into six rectangles and roll each rectangle horizontally. Place on a non-stick baking sheet, seam down. Brush with butter and sprinkle with sanding sugar. Bake for ~15 minutes until pastry is puffed and golden.