Unroll the puff pastry and carefully pull the edges to lengthen it into an oval shape. Drain the fruit salad with papaya and set aside the juice. Place the fruit on the puff pastry along the longest side, sprinkle with the currants and almonds and wrap the pastry over the fruit salad, tucking it underneath. Seal the edges by pressing with your fingers, make small cuts in the top with a knife to help cooking and dust with plenty of icing sugar. Bake in the oven at 200° for half an hour. In the meantime, place the fruit salad juice in a small saucepan and leave it to boil until it has reduced by 2/3 to obtain a syrup. Serve the strudel in slices with the fruit syrup.