This tart is a really perfect dish to throw together in the summer. Puff pastry makes a flaky, buttery crust that serves as a vehicle to delicious seasonal flavors. A creamy blend of mascarpone, goat cheese, and shallots are the base for this tart, and perfectly ripe tomatoes are the star. They get even sweeter as they roast in the oven, and with a drizzle of balsamic glaze, a sprinkle of chives and sea salt, it's a showstopping summer appetizer.