Chef Tips: Keep the pastry cold: Work quickly to prevent the butter in the dough from melting, which is critical for that iconic flake in your Blueberry Danish Tart Recipe. Dry your berries: Pat fresh blueberries with a paper towel to remove excess moisture, ensuring the crust does not become soggy while the tart bakes. Score deeply: Use a sharp knife to lightly score the border, which guides the puff pastry as it expands vertically, creating a beautiful frame for the fruit. Use a thermometer: Ensure your oven hits the target temperature before inserting the pastry, as a hot environment is necessary for the initial lift of the dough.