Is Key lime pie filling gluten-free?

Key lime pie is a classic American dessert, known for its bright citrus flavor. With the rising popularity of gluten-free diets, many people wonder if traditional Key lime pie filling contains gluten. The short answer is yes, authentic Key lime pie filling is gluten-free.

Gluten is a protein found in grains like wheat, barley and rye. It acts as a glue that holds food together, giving breads and baked goods their chewy texture. People with celiac disease or gluten sensitivity need to avoid gluten, as it damages the small intestine and causes a range of unpleasant symptoms.

What ingredients are in Key lime pie filling?

A traditional Key lime pie has just a few simple ingredients: Key lime juice, sweetened condensed milk, and egg yolks. These ingredients come together to form the tart, creamy filling that is the hallmark of Key lime pie.

Key lime juice provides the bright, floral citrus flavor. Freshly squeezed juice from tiny Key limes is ideal. However, most recipes call for bottled Key lime juice, which is easier to find and provides consistent results.

Sweetened condensed milk adds sweetness and a rich, creamy texture. It must be sweetened condensed milk, not evaporated milk. The sugar content helps thicken the pie filling as it bakes.

Egg yolks contribute body and structure. They also add color, helping achieve the custard-like yellow filling.

In addition, Key lime pie is often made with a graham cracker crust. This crisp, slightly sweet crust provides contrast to the rich filling.

Do any of these ingredients contain gluten?

No, none of the main ingredients in Key lime pie contain gluten. Here is a breakdown:

  • Key lime juice – Gluten-free
  • Sweetened condensed milk – Gluten-free
  • Egg yolks – Gluten-free
  • Graham cracker crust – Can contain gluten depending on brand, so check labels

The only potential source of gluten would be the graham cracker crust. While traditional graham crackers contain wheat flour, gluten-free graham crackers made with other flours are widely available.

Are there any risks of cross-contamination?

When preparing Key lime pie at home using gluten-free ingredients and equipment, there should be minimal risk of cross-contamination with gluten. However, those with celiac disease or severe gluten sensitivity should still take precautions.

Potential sources of cross-contamination include:

  • Using baking equipment that has previously handled gluten-containing foods
  • Preparing pie on a countertop with gluten residue
  • Using contaminated utensils to scoop fillings
  • Storing pie near other baked goods with gluten

To avoid cross-contamination, thoroughly wash all equipment and surfaces before preparing the pie. Use designated gluten-free utensils. Store the finished pie well wrapped and away from glutenous foods.

What about Key lime pie from restaurants or bakeries?

Dining out with celiac disease or gluten sensitivity always involves some degree of risk. Even if a menu item seems gluten-free, cross-contamination can occur in restaurant kitchens.

When ordering Key lime pie in a restaurant, be sure to ask about preparation procedures. Inquire about whether gluten-free ingredients are used and the likelihood of cross-contamination. The more informed you are, the better you can assess risk.

If you have severe celiac disease or a wheat allergy, it may be safest to avoid restaurant Key lime pie entirely or only dine at dedicated gluten-free establishments.

How to make a gluten-free Key lime pie

Thankfully, it’s easy to adapt traditional Key lime pie to be gluten-free. Here are some tips:

  • Use bottled Key lime juice, sweetened condensed milk and egg yolks for the filling
  • Make or purchase a gluten-free graham cracker crust
  • Thoroughly clean cooking equipment that may have touched gluten
  • Prepare pie in a gluten-free kitchen or use sanitized equipment

This simple gluten-free recipe only requires a few ingredients:

Gluten-Free Key Lime Pie Recipe


  • 1 1⁄2 cups gluten-free graham cracker crumbs
  • 5 tbsp melted butter or coconut oil
  • 1 tbsp sugar


  • 2 14-oz cans sweetened condensed milk
  • 1⁄2 cup freshly squeezed Key lime juice
  • 4 egg yolks
  1. Preheat oven to 350°F. Mix crust ingredients and press into a 9-inch pie pan coated with nonstick spray.
  2. Bake crust for 5 minutes then set aside.
  3. In a bowl, whisk condensed milk and lime juice. Add egg yolks and whisk until smooth.
  4. Pour filling into prepared crust and bake for 15 minutes.
  5. Chill pie for at least 1 hour before serving.

Garnish with whipped cream and lime zest if desired. Enjoy your gluten-free treat!

Health benefits of Key lime pie

Going gluten-free doesn’t mean giving up decadent desserts. In fact, Key lime pie offers a few potential health benefits:

  • Immune-boosting vitamin C – Key limes are an excellent source of vitamin C, which supports immune function.
  • Bone-strengthening vitamin D – The egg yolks provide vitamin D, which promotes calcium absorption for healthy bones.
  • Potential heart benefits – Some research links citrus flavonoids with improved heart health markers like lower LDL cholesterol.

Of course, these benefits must be weighed against the high sugar content. But enjoyed occasionally, gluten-free Key lime pie can be part of a healthy, balanced diet.

Choosing your ingredients wisely

Maximize the nutrition of your Key lime pie by choosing quality ingredients. Some tips:

  • Select organic or locally sourced eggs from free-range hens for more omega-3s
  • Use fresh-squeezed Key lime juice if possible for the most antioxidants
  • Look for unsweetened condensed milk without additives or preservatives
  • Make your own crust with gluten-free oats or nuts for added fiber and protein

Common questions about Key lime pie

Is Key lime different from regular lime?

Yes, Key limes are smaller, seedier and more tart than the common Persian limes found in grocery stores. While regular lime juice can be substituted, Key limes have a more floral, aromatic flavor that’s ideal in pie.

Can I use bottled lime juice?

Bottled Key lime juice makes an acceptable substitute when fresh limes are unavailable. Make sure to read labels and choose 100% lime juice without additives. For best flavor, avoid bottle lime juice blends.

What can I use instead of sweetened condensed milk?

Sweetened condensed coconut milk is a popular dairy-free option. For a lower sugar version, some recipes use regular unsweetened coconut milk combined with honey or maple syrup to taste.

Is Key lime pie better with milk or cream?

Sweetened condensed milk is traditional and helps create the pie’s signature gooey texture. Heavy cream can work but produces a looser, more custard-like filling. Keep the egg yolk quantity the same if substituting cream for milk.

Can Key lime pie be frozen?

Yes, Key lime pie freezes well for up to 2-3 months. Double wrap slices in plastic wrap then foil. Thaw overnight in the fridge before serving. The texture may be slightly softer after freezing but the flavor remains unchanged.

Fun facts about Key lime pie

  • The first published Key lime pie recipe appeared in 1931 in a St. Augustine, FL cookbook.
  • Key limes were brought to Florida in the 1500s by Spanish explorers and became a staple ingredient.
  • In Key West, the annual Key Lime Festival celebrates the iconic pie each July 4th weekend.
  • Florida passed a law in 2006 declaring Key lime the official state pie.
  • Key lime pie is sometimes called “Florida’s official comfort food.”

History of Key lime pie

While the exact origins are unclear, Key lime pie seems to have emerged in the late 19th or early 20th century after canned sweetened condensed milk became readily available. Before modern refrigeration, the extremely tart Key limes helped preserve the creamy concoction.

Early recipes used a simple ship’s cracker crust topped with milk, lime, and egg filling. The pie was popularized by early Florida Keys settlers and travelers as a regional treat.

As Key lime pie gained fame, cooks began adapting the recipe. Whipped cream or meringue toppings were added, along with pastry or graham cracker crusts. Today it remains an iconic Southern dessert.

Where are Key limes grown?

Key limes originate from Southeast Asia and were later introduced to the Florida Keys and tropical regions of the Americas. They grow best in hot, humid climates.

Most commercially produced Key limes today come from Florida and Mexico. However, you may also find them grown domestically in Texas, California and Hawaii.

How Key lime pie fits into a healthy diet

Like any rich dessert, Key lime pie is high in sugar and should be enjoyed in moderation as part of a balanced diet. But it can be a special treat for most people.

Tips for enjoying Key lime pie healthfully:

  • Savor a small slice, focusing on quality over quantity
  • Share the pie so you don’t overdo portions
  • Exercise portion control at holidays, celebrations and vacations
  • Complement your slice with a salad or other nutritious foods
  • Select healthy fats like nuts or avocado in your other meals that day
  • Drink plenty of water to stay hydrated
  • Substitute lower-sugar ingredients when possible

With mindful moderation, a gluten-free Key lime pie can be happily enjoyed guilt-free!


Key lime pie is an American classic dessert that also happens to be naturally gluten-free. The traditional ingredients – Key lime juice, sweetened condensed milk, and eggs – contain no gluten. While restaurant versions may pose some cross-contamination risks, Key lime pie can easily be prepared gluten-free at home. Choosing high quality ingredients maximizes nutrition. And when enjoyed occasionally as part of an overall balanced diet, this refreshing citrus treat remains a delicious option for those on a gluten-free diet.

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