The Absolute Best Citrus Fruit For A Tart And Tangy Alternative To Classic Lemon Bars - Tasting Table
Briefly

The origin of lemon bars dates back to the early 1960s, and a delicious variation involves using grapefruit, which adds a tart twist to the classic dessert.
Grapefruit makes an excellent swap for lemons due to its tartness. Adding grapefruit zest enhances the flavor and maintains the rich buttery crust.
For a more balanced tartness, substitute a bit of grapefruit juice with fresh lemon juice or add lemon zest to the mixture.
Switching lemons for grapefruit changes the color of the bars from yellow to a lovely coral, making them visually distinct as well.
Read at Tasting Table
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