Ingredients
Method
Preparation
- Preheat oven to 350 degrees Fahrenheit. Lightly grease or line an 11x7-inch baking dish with parchment paper that overhangs 2-inches on both sides.
- For the crust: Combine the flour, powdered sugar, salt, and butter in a food processor or stand mixer. Pulse or mix until mixture resembles fine crumbs that start to clump together.
- Press onto the bottom of the prepared baking dish. Bake at 350 degrees F for 18-20 minutes, or until golden brown.
Filling
- Whisk together the sugar and flour in a bowl. Add the eggs, one at a time, whisking well after each addition.
- Add the zest, juice, and food coloring if desired. Whisk together.
- Pour filling over hot crust and bake an additional 20 minutes or until filling no longer jiggles and edges brown.
Cooling and Serving
- Let cool completely in the pan, about 1 hour. Refrigerate for at least 1-2 hours until cold.
- Lift bars out of pan with parchment paper for easy cutting and serving. Dust with extra powdered sugar or a pinch of sea salt before serving.
Notes
For best results, use fresh grapefruit juice and zest. Do not overbake; a slight jiggle in the center indicates custard perfection. Store bars in refrigerator in an airtight container for up to 4-5 days.
