Soften The Rice Papers By Brushing Each One With Warm Water. Or You Can Soak Each One In A Bowl Of Warm Water. Then, After About 20 Seconds, Fold In About 1-Inch In On The Two Opposite Sides And The Top. For Each Roll, Place A Leaf Of Lettuce On A Rice Paper And Pile On A Few Beansprouts, Herb Leaves And Vermicelli. Add Some Pork And 2 Prawns, And Roll Up. To Make The Nuoc Cham Dipping Sauce, Combine All Ingredients With 2 Tablespoons Water. Serve The Rolls With The Nuoc Cham For Dipping.