Continue to cook the sirloin roast until a meat thermometer registers 130 degrees at the CENTER of the roast for medium rare at the center, medium on the ends. This should take around 20 â 30 minutes per pound, but never rely on exact times. Use a meat thermometer instead.
Storage: Keep the box because unused phyllo dough can be refrigerated or refrozen. You can wrap any leftover phyllo tightly with plastic wrap, place in its original box and keep in the refrigerator for up to 2 weeks. For longer storage of up to 2 - 4 months, refreeze phyllo.
Remove the package of frozen phyllo dough from the box but leave it in the plastic. Set the plastic on a microwaveable dish or plate. Place the plastic package of dough in the microwave and defrost for 30 to 45 seconds. Follow the microwave defrosting instructions on the package if it lists a specific time or power level for that brand of dough.