Honey (Best Option)
2/3 cup honey per 1 cup granulated sugarHoney works well as a substitute because it is sweeter than granulated sugar, so less is needed, and it dissolves easily into the custard mixture, maintaining smoothness. Its natural sugars caramelize gently, adding subtle complexity without overwhelming the quiche.
When using honey, reduce other liquids slightly to compensate for its moisture content, and mix thoroughly to ensure even distribution. Avoid overheating to prevent bitterness.
The final quiche will have a slightly richer texture and a mild floral note, but the overall savory balance remains intact, making honey an excellent choice.