Use the ripest, sweetest strawberries you can find for the best flavor. For a vegan version, substitute the mascarpone cheese and heavy cream with plant-based alternatives. Refrigerating the sando for at least an hour helps the flavors meld and makes slicing easier. A serrated knife is essential for clean, even cuts without squishing the filling. Feel free to experiment with other fruits, such as kiwi, mango, or peaches, depending on the season and your preferences.