extra-virgin olive oil
large yellow onion, finely chopped
Kosher salt
Freshly ground black pepper
chopped fresh rosemary
chopped fresh sage
sweet Italian pork sausage, casings removed
chopped fresh parsley
Worcestershire sauce
All-purpose flour, for surface
(14-oz.) pkg. puff pastry, thawed
Dijon mustard, divided
large egg, lightly beaten
toasted sesame seeds
poppy seeds
Cranberry chutne