2 pounds beef stew meat, cut into bite-sized chunks
1 sheet frozen puff pastry
1 chopped onion
1 diced rib of celery
2 cups beef stock
1/2 cup flour
2 tablespoons oil
3 sprigs fresh thyme
2 bay leaves
1 teaspoon dried oregano
3 minced garlic cloves
1 egg white
1 teaspoon water
1 tablespoon Worcestershire sauce
Salt and pepper to taste