Combine wine craisins and butter. Reduce to a syrupy sauce.
Puff pastry: 1 sheet frozen puff pastry, defrosted 1 egg yolk combined with 1/2 teaspoon salt
Assembly: Put pastry on a parchment lined sheet pan. Place salmon mousse down the middle and top with spinach filling. Roll pastry jelly-roll style. Brush egg yolk over the entire surface and bake in a preheated 325 degree oven for about 40 minutes, or until golden brown. Let empanada cool down. Cut into 1-inch thick sections and serve each slice with a generous portion of cranberry port sauce.