Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (2024)

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Recipe

21Feb 2009

Lemon Bars

Filed Under:

  • Brownie + Bar
  • Dessert
  • Recipe

29 Comments

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (1)

It’s funny how preparing a single recipe can often inspire a chain of additional dishes due to leftover ingredients. After baking the Raspberry Crumb Breakfast Bars for Valentine’s Day, I was left with four lemons without a use. I turned to the America’s Test Kitchen Family Cookbook for ideas and decided that this lemon-intensive Lemon Bar recipe would be perfect. The smooth and vibrant curd topping really makes these bars shine, and the shortbread crust is an outstanding accompaniment. Now, what to do with seven lonely egg whites?

For the crust

  • 1 1/4 cups unbleached all-purpose flour
  • 1/2 cup confectioners’ sugar, plus extra for dusting
  • 1/2 teaspoon salt
  • 1 stick unsalted butter, softened but still cool, cut into 1-inch pieces

For the lemon filling

  • 7 large egg yolks
  • 2 large eggs
  • 1 cup plus 2 tablespoons granulated sugar
  • 2/3 cup fresh lemon juice (4-5 lemons)
  • 1/4 cup grated lemon zest
  • 1/2 stick unsalted butter, cut into 4 pieces
  • 3 tablespoons heavy cream

Make crust

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (2)

Adjust an oven rack to the middle position and heat the oven to 350°F. Line a 9-inch square pan by folding two 16-inch pieces of foil lengthwise to measure 9 inches wide. Fit one sheet on the bottom of the pan, pushing it into the corners and up the sides (overhang will help in removal of baked bars). Fit the second sheet in the pan in the same manner, perpendicular to the first sheet. Spray the sheets with nonstick cooking spray.

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (3)

Process the flour, confectioners’ sugar, and salt in a food processor until combined, 3 seconds. Add the butter and process to blend, 8 to 10 seconds, then process until the mixture is pale yellow and resembles coarse meal, about three 1-second pulses. Sprinkle the mixture into the prepared pan and press firmly with your fingers into an even layer over the entire pan bottom. Bake the crust until golden brown, about 20 minutes.

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (4)

Make filling

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (5)

While the crust is baking, whisk the yolks and whole eggs together in medium nonreactive saucepan. Add the granulated sugar and whisk until just combined. Add the lemon juice, zest, and pinch of salt; whisk until combined.

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (6)

Add the butter pieces, and cook over medium-low heat, stirring constantly, until the mixture thickens slightly and registers 170°F on an instant-read thermometer, about 5 minutes.

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (7)

Immediately pour the curd through a single-mesh stainless steel strainer set over a clean non-reactive bowl. Stir in the heavy cream; pour the curd into the warm crust immediately.

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Bake until the filling is shiny and opaque and the center jiggles slightly when shaken, 10 to 15 minutes.

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (9)

Let cool completely on a wire rack, about 2 hours, before removing the bars from the pan using the foil and cutting into squares. Dust with confectioners’ sugar before serving.

Makes 16 bars.

Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (10)

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  1. You’re like the cake baking grandma I never had.

  2. David – Haha! I’m the cake baking grandma that I never had 😉

  3. I love citrus flavoured baked treats! And you can make pavlova with your egg whites! Maybe perfect a chocolate flavoured one for me!

  4. oh, boy.

    drool.

  5. Another great recipe! Thanks for sharing!

    I adore lemon bars!

  6. I’m not one to look at for inspiration but the first thing that popped into my head was meringue (duh, right?!).

    Terrific photos especially that last one!
    ~ingrid

  7. Those lemon bars looks so good!

  8. I am from México, I had the good fortune of visiting New Zeland and Australia a couple of years ago, and I tried the lemon bars, and of course, here, I haven´t try them again!! Thank you for sharing this recepie. I want to close my eyes and feel like I´m there, for just a moment!!

    best wishes!!
    katya

  9. The best LB’s I’ve found in our area are EuroPane’s. If you any better nearby…report back to us.

  10. that looks so good after burnin 1! 🙂

    happy 420.

  11. I love you Mike

  12. A came across this post late last night then ended up dreaming about these delicious looking lemon bars. I’m going to have to make them today!

  13. I’d like to start by saying that I LOVED these. After I cut them I removed the foil and scraped every bit of lemony goodness off I could. Even my lemon dessert hating boyfriend liked these. However, much to my dismay these didn’t travel that well. I make them a day in advance to take to a holiday party. The powdered sugar sort of liquefied on top, and they looked smooshy. I was wondering if you had any tips for the next time? They came out so fab I’d love to keep making them.

  14. Marie – I’m so happy to hear that the lemon bars turned out well! Next time, reserve the powdered sugar treatment for just before serving. I think that would solve the problem nicely. Also, the lemon bars are well balanced even without the sugar, so you could just not bother as well. Enjoy!

  15. Ooooh I am so making these tomorrow! Have a bunch of yolks left over from making macarons! Thanks for the recipe!how long will they keep would you know?

  16. Magpie – The lemon bars should last up to a week in the fridge. However, the powdered sugar on top will dissolve within a day. You can store the bars in the fridge and dust with powdered sugar to serve.

  17. Thanks for the prompt reply! sounds like good use of those yolks. Will let you know how they come out for me 🙂

  18. Tried this recipe today. Another recipe my wife and I love, but I may have overcooked the lemon filling as I didn’t have an instant read thermometer. The crust was like no other lemon bar we had before. It was perfect.

  19. Ralph – Thank you very much for reporting back on all of the recipes that you’ve tried! I love hearing about your cooking and baking adventures 🙂

  20. Great site! Looking forward to posts delivered to my email.

    God Bless You!

  21. How much salt do you put in the filling? Text says to add salt but it’s only listed as an ingredient for the crust.

  22. Jennifer — The recipe calls for a “pinch” of salt. Thanks for pointing that out!

  23. Thanks for sharing this Cook’s Illustrated Lemon Bars. I was assigned to make LB for a party this week and went to several of my CI books to see what they had, but no Lemon Bars. I did find that their original recipe was in their May 1998 magazine, so I’m so glad I found you and the recipe on Pinterest. Thanks again!

  24. I have been cooking for 50+ years
    Love desserts
    Made lemon bars for at least 20 years
    These are among the worst I have ever made
    The crust is excellent providing support and crunch and good taste
    The filling is a gelatinous wiggly mess and so rich it is like a heart attack in a box
    I’ve found. That with ATK you have to buy into THEIR definition of what the recipe should produce
    I don’t always agree with their choice.

  25. Make macarons (not macaroons) with the egg whites, if it’s not too humid! They’re actually easy. The easiest recipe I saw, the one I’ve used for years, comes from Food Wishes by Chef John. He has a blog, and YouTube videos.

  26. Rosemarie, I heartily agree with you. They have odd New England or personal tastes, I had tried three of their recipes in the past, and found them all to be too salty, too rich, or just too disappointing. Dismal, I don’t like wasting food. I like their explanations of cooking chemistry, but would never follow their recipes ever again. As an example, why do they try to make inauthentic tamales when we have Rick Bayliss and Pati Jinich on PBS already, who are authentic. They don’t even know that tamales is the plural, and one is called a tamal, not a tamale. They love to substitute bizarre ingredients, claiming they can’t find the real ones, which isn’t true. I’ll never trust their recipes again, after disappointing flops that were the fault of their recipes, not mine. Pie, tater tots, red beans and rice. Meh. Even Walmart carries the traditional Camelia brand of red beans. I’ve never encountered so many recipes that consistently fit their tastes, but not the tastes of anyone else. They fiddle with everything.

  27. Made these for my boyfriend’s birthday, I had never made nor tried lemon bars so I felt a bit out of my element, but he insisted! They came out perfect!! I think next time I might do an almond flour substitute for the base for a fun flavor enhancement. I also read about making granola and food processing that with butter for a nutty-toasty base which might be nice with the lemon. Can’t wait to look into more recipes on your page!

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Best Lemon Bars Recipe | America's Test Kitchen | Gastronomy (2024)

FAQs

What is the trick to cutting lemon bars? ›

I have found that a hot, wet, very sharp knife helps quite a bit. Also, make sure the bars are completely chilled before cutting.

Why did my lemon bars fall apart? ›

There are a couple of things that can impact the integrity of your lemon bars. The first is if your crust has cracks in it and the lemon curd fills in the cracks. This can cause your lemon bar to break! It may also break if you don't bake the crust long enough or the lemon layer is underbaked.

What if lemon bars are not cooked enough? ›

Throw them back in the oven at the original baking temperature. Keep an eye on them; rotate every five minutes or so. Once the lemon has set up (doesn't jiggle) they should be done.

Why did the top of my lemon bars crack? ›

Don't Over-Bake.

If you leave them in the oven too long, it can cause your bars to crack. The surface of your lemon bars should have small bubble holes, but not large cracks.

Should I refrigerate lemon bars before cutting? ›

Lemon bars should be stored in an airtight container and refrigerated in order to prevent bacterial growth or foodborne illness. The filling in lemon bars is made with eggs and can become a breeding ground for bacteria if it's kept in the danger zone (between 41 and 153 degrees F).

How do you cut lemon bars without sticking to the knife? ›

For easier cutting, you can chill the lemon bars in the refrigerator for a short time before cutting. Wipe the knife clean after each cut to avoid any build-up of sticky residue. If the lemon bars are sticking to the knife, try dipping it in warm water and drying it before making the next cut.

Why won t my lemon bars set? ›

Runny lemon bars - This is a common issue for people who are making lemon bars for the first time. Usually, it just means that you need to bake your bars longer. If your bars seem to brown at the edges, you can cover them with aluminum foil and turn down the heat.

Should homemade lemon bars be refrigerated? ›

Do lemon bars need to be refrigerated? Yes, it's best to store lemon bars in the refrigerator. To store them, simply cover them with plastic wrap and pop them in the fridge. Stored this way, your lemon bars should keep for about 1 week.

Can you leave lemon bars out over night? ›

Serving, Storing, and Freezing

Serving: Lemon bars are fine to keep out at room temperature for up to 6 hours or so. Storing: Store cooked lemon bars or leftovers in the refrigerator. Cover tightly with plastic wrap and store for up to 2 days. Make-Ahead: You can make lemon bars up to two days in advance.

Why do my lemon bars look like scrambled eggs? ›

Why do my lemon bars look like scrambled eggs? If your lemon bars look like scrambled eggs, it's because you've overcooked them. The key to perfect lemon bars is to cook them until the filling is set, but not too long. You want the filling to be firm but still have a little bit of jiggle to it when you shake the pan.

Why are my lemon bars sticky? ›

Underbaking: This is the most common reason for gooey lemon bars. The filling needs enough time to set, which can be tricky since oven temperatures can vary and the visual cues for doneness are subtle. Solution: Bake the bars until the filling is just set and no longer wobbles when you gently shake the pan.

Why not to cook lemon juice? ›

But, it must be noted that vitamin C is extremely heat-sensitive, and the nutrient gets easily destroyed by heat. “This is why you should never put lemon juice on food which is still hot, or still cooking on the flame.

Can you Rebake undercooked lemon bars? ›

Undercooked lemon bars can be rebaked by placing them back in the oven for about five minutes. Be sure to watch them closely, as they can quickly become overcooked.

Is it OK to freeze lemon bars? ›

Yes, lemon bars freeze beautifully—they are even good frozen! To freeze the bars, let them cool completely and freeze the batch whole, covered tightly with aluminum foil or plastic freezer wrap, for up to three months.

Why is my lemon juice foamy? ›

The foam that occurs is due to the reaction of insoluble fiber with the oxygen and is very normal. Feel free to give it a stir and it should get rid of some of the foam. You can also strain the juice once to remove some of the foam.

How do you cut bars cleanly? ›

Firmly press knife down through the bars and gently drag the knife out of the end closest to you. Repeat this step as many times as needed. With each pass, wipe the chef's knife clean with a damp cloth. Coat with cooking spray and wipe clean again.

How do you cut bars evenly? ›

Use a Ruler

For the most precise results, measure the bars with a ruler and use a toothpick (or tip of a knife) to make small marks where you'll slice. This process is beneficial if you need an exact number of treats.

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