The key to a crisp tart is dry tomatoes—slice them ahead, lay them on paper towels, and let them drain for a few minutes before assembling. Swap the mozzarella for burrata if you want something creamier, or use heirloom tomatoes in mixed colors for a beautiful presentation. Gluten-free puff pastry works well too. The basil oil keeps in the fridge for a few days; drizzle any extra over eggs or roasted vegetables. This tart is best the day it's made but can be gently rewarmed in a 350°F oven.