If you have the time to do so, the best way to reheat this tart is definitely in the oven. Preheat oven to 350°F (180°C) and heat your tart for about 5 to 10 minutes or until hot. Alternatively, this tart can be reheated in a microwave oven in just a few seconds. For that, place your tart on a microwave-safe plate and heat it at high temperature for a few seconds. This is the quickest way to do it but it tends to get the pie crust soggy.