Thaw pastry at room temperature for 5 minutes.
Heat oven to 400 degrees F. In small bowl combine pitted cherries, ricotta cheese and walnuts. Mix well and set aside. Unfold pastry onto lightly floured surface. Roll to 14x10 inch rectangle. Spread ricotta/cherry/walnut mixture over
pastry, covering to within 1 inch of either end.Brush all edges with egg mixture. Beginning at long end, roll up pastry jelly-roll-style ; pinch seams and ends to seal. Place on baking sheet. With sharp knife , cut diagonal slits
, one inch apart, across top of pastry. Brush with egg mixture. Bake 25 minutes until golden. Cool on baking sheet on wire rack a few minutes.