Combine first 3 ingredients in a shallow dish or large heavy duty sip top plastic bag. Cover or seal, chill8 hours turning occasionally.
Remover steaks from marinade, reserving marinade. Press pepper evenly onto both sides of steaks.
Cook steaks in a large nonstick skillet over medium high heat 4 to 5 min on each side. Set aside, cool completely.
Bring reserved marinade to a boil in a medium saucepan over medium heat. Stir in mushrooms and worcestershire sauce, reduce heat and simmer 10 min. Keep warms.
Unroll crescent rolls and separate into 8 triangles, press perfortions to seal. Roll rectangles to 6 inch squares/
Place 1 steak in cener of each pastry. Bring corners of 1 pastry square to center, pinching to seal. Repeat with each steak. Brush with egg white . bake seam side own on lightly greased baking pan approximately 13 min or until pasty is golden brown and flaky.
Spoon sauce onto plate and set pastry on top. Sprinkle with fresh chives