For a perfectly smooth and creamy orange filling, it’s essential to pay attention to your method and ingredients. Start by gently melting the white chocolate with the cream to create a rich base, ensuring the chocolate doesn’t scorch. When combining the white chocolate mixture with the orange juice, cornstarch, sugar, and zest, be sure to whisk continuously to prevent lumps from forming. This initial heating should thicken the mixture, achieving a custard-like consistency. After cooling, briefly beating the mixture helps to incorporate air, resulting in a lighter texture. If you want a fluffier consistency, consider folding in some whipped cream before filling the tartelettes. Finally, allow the filled tartelettes to chill properly for at least 2 hours. This step is crucial as it helps the cream set and melds all the flavors together, giving you a creamy dessert with an impeccable texture.