Keep your puff pastry chilled until the very moment you put it in the oven for a better lift throughout the Blueberry Danish Tart Recipe process. Use a microplane to zest your lemon, as this provides a fine texture that incorporates more evenly into the cream cheese filling. Pat your blueberries dry with a paper towel before adding them to the tart to prevent unnecessary pooling of liquid during the bake. Lightly dust the edges of the pastry with sparkling sugar before baking if you desire a crunchy, bakery-style crust finish.