Indulge in the zesty and refreshing flavors of these grapefruit lemon bars. Perfect for a summer treat or a delightful dessert, these bars combine the tanginess of lemon juice and grapefruit juice with a buttery crust that melts in your mouth.
While most of the ingredients for this recipe are common pantry staples, you might need to pick up fresh grapefruit and lemons for their juice and zest. Make sure to get unsalted butter to control the saltiness of the crust. If you don't already have them, you may also need to grab some extra eggs and all-purpose flour.

Ingredients for Grapefruit Lemon Bars Recipe
Butter: Provides a rich, creamy base for the crust.
All-purpose flour: Used in both the crust and the filling for structure and texture.
Granulated sugar: Adds sweetness to both the crust and the filling.
Eggs: Helps to set the filling and adds richness.
Lemon juice: Adds a tangy, citrusy flavor to the filling.
Grapefruit juice: Adds a unique, slightly bitter citrus flavor to the filling.
Grapefruit zest: Enhances the grapefruit flavor in the filling.
Technique Tip for Making These Citrus Bars
When making the crust, ensure that the melted butter is evenly mixed with the all-purpose flour and granulated sugar to create a uniform dough. This will help achieve a consistent texture and prevent any dry spots. Press the mixture firmly into the baking dish to create a solid base that will hold up well under the citrus filling. For the filling, whisk the eggs thoroughly before adding the lemon juice, grapefruit juice, and grapefruit zest to ensure a smooth and well-incorporated mixture. This will result in a creamy, tangy layer that complements the buttery crust perfectly.
Suggested Side Dishes
Alternative Ingredients
melted unsalted butter - Substitute with melted coconut oil: Coconut oil provides a similar fat content and moisture, with a slightly different flavor profile that can complement citrus.
all-purpose flour - Substitute with whole wheat flour: Whole wheat flour adds a nutty flavor and more fiber, though it may make the bars denser.
granulated sugar - Substitute with coconut sugar: Coconut sugar has a lower glycemic index and adds a caramel-like flavor.
granulated sugar - Substitute with honey: Honey is a natural sweetener that can add a floral note, though it will make the mixture more liquid.
large eggs - Substitute with flax eggs: Flax eggs (1 tablespoon ground flaxseed + 3 tablespoon water per egg) are a vegan alternative that provides binding.
fresh lemon juice - Substitute with lime juice: Lime juice offers a similar acidity and citrus flavor, though slightly more tart.
fresh grapefruit juice - Substitute with orange juice: Orange juice is sweeter and less bitter, providing a different but still citrusy flavor.
grapefruit zest - Substitute with lemon zest: Lemon zest offers a similar citrus aroma and flavor, though less bitter.
Other Alternative Recipes Similar to This One
How to Store or Freeze These Citrus Bars
Allow the grapefruit lemon bars to cool completely at room temperature. This ensures the filling sets properly and makes them easier to handle.
Once cooled, cut the bars into squares using a sharp knife. For cleaner cuts, wipe the knife with a damp cloth between slices.
To store, place the bars in an airtight container. If stacking the bars, place a sheet of parchment paper between layers to prevent sticking.
Store the container in the refrigerator. The bars will stay fresh for up to 5 days, maintaining their delightful citrus flavor and texture.
For longer storage, consider freezing the bars. First, arrange the cut bars on a baking sheet lined with parchment paper, ensuring they do not touch each other.
Place the baking sheet in the freezer for about 1-2 hours, or until the bars are firm. This prevents them from sticking together when stored.
Once frozen, transfer the bars to a freezer-safe container or a resealable plastic bag. Label the container with the date to keep track of freshness.
When ready to enjoy, thaw the bars in the refrigerator overnight. For a quicker option, let them sit at room temperature for about 30 minutes to an hour.
Optionally, dust the thawed bars with powdered sugar before serving to enhance their presentation and add a touch of sweetness.
How to Reheat Leftovers
Oven Method:
- Preheat your oven to 300°F (150°C).
- Place the Grapefruit Lemon Bars on a baking sheet lined with parchment paper.
- Cover the bars loosely with aluminum foil to prevent them from drying out.
- Heat for about 10-15 minutes, or until they are warmed through.
- Remove from the oven and let them cool slightly before serving.
Microwave Method:
- Place a Grapefruit Lemon Bar on a microwave-safe plate.
- Cover it with a microwave-safe lid or another plate to maintain moisture.
- Heat on medium power for 20-30 seconds.
- Check the temperature and heat for an additional 10 seconds if necessary.
- Let it sit for a minute before enjoying.
Toaster Oven Method:
- Preheat your toaster oven to 300°F (150°C).
- Place the Grapefruit Lemon Bars on a toaster oven tray.
- Cover them with a piece of aluminum foil.
- Heat for 8-10 minutes, checking occasionally to ensure they don’t overheat.
- Allow them to cool slightly before serving.
Room Temperature Method:
- Remove the Grapefruit Lemon Bars from the refrigerator.
- Let them sit at room temperature for about 30 minutes to an hour.
- Enjoy them as they reach a pleasant, slightly chilled temperature.
Best Tools for Making Citrus Bars
Oven: Preheat to 350°F (175°C) for baking the crust and filling.
Baking dish: Use a 9x13 inch dish to form and bake the bars.
Mixing bowl: Combine ingredients for both the crust and the filling.
Whisk: Blend the sugar, flour, eggs, lemon juice, grapefruit juice, and zest smoothly.
Measuring cups: Measure out the flour, sugar, butter, lemon juice, and grapefruit juice accurately.
Measuring spoons: Measure the grapefruit zest precisely.
Spatula: Press the crust mixture evenly into the baking dish.
Cooling rack: Allow the bars to cool completely before cutting.
Knife: Cut the cooled bars into squares.
Sifter: Dust the bars with powdered sugar if desired.
How to Save Time on Making These Citrus Bars
Prepare the crust ahead: Mix and press the crust ingredients into the baking dish the night before. Store it in the refrigerator until ready to bake.
Use a citrus juicer: A citrus juicer will quickly extract the lemon and grapefruit juice, saving you time and effort.
Pre-measure ingredients: Measure out all ingredients before starting. This ensures a smooth and quick assembly process.
Cool quickly: Place the baked bars in the refrigerator to cool faster, so you can cut and serve them sooner.

Grapefruit Lemon Bars Recipe
Ingredients
Crust
- 1 cup unsalted butter melted
- 2 cups all-purpose flour
- ½ cup granulated sugar
Filling
- 1 ½ cups granulated sugar
- ¼ cup all-purpose flour
- 4 large eggs
- ½ cup fresh lemon juice
- ½ cup fresh grapefruit juice
- 1 tablespoon grapefruit zest
Instructions
- Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking dish.
- In a mixing bowl, combine melted butter, 2 cups of flour, and ½ cup of sugar. Press the mixture into the prepared baking dish.
- Bake the crust for 15-20 minutes, or until lightly golden. Remove from oven and set aside.
- In another bowl, whisk together 1 ½ cups of sugar and ¼ cup of flour. Add the eggs, lemon juice, grapefruit juice, and grapefruit zest. Mix well.
- Pour the filling over the baked crust. Bake for an additional 20-25 minutes, or until the filling is set.
- Let the bars cool completely before cutting into squares. Dust with powdered sugar if desired.
Nutritional Value
Keywords
Suggested Appetizers and Main Courses for These Citrus Bars
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