This post may contain affiliate links.
This Luau Cake is a showstopping tropical sheet cake with a moist triple-pineapple flavor, frosted to look like a bright blue ocean with a golden graham cracker sand beach. It is the ultimate centerpiece for a Hawaiian party, summer birthday, or backyard luau, and it is so much fun to decorate. If you love an impressive dessert, our spice layer cake is another guaranteed crowd-pleaser.
Built on a pineapple cake base with a creamy pineapple buttercream filling and ocean-blue frosting, this luau cake tastes as tropical as it looks, with candy seashells and colorful flowers finishing the beach scene.
Luau Cake Quick Look
- 🕒 Prep Time: 30 minutes
- 🌡️ Cook Time: 30 minutes
- ⏳ Total Time: 1 hour
- 🍽️ Serving: 18 slices
- ⚡ Calories: 534kcal
- 🌶️ Flavor Profile: Triple pineapple cake with an ocean-blue luau beach design
- ✋ Difficulty: Intermediate, fun to decorate
Quick Answer
To make a luau cake, bake two white pineapple-flavored cakes and let them cool. Beat together a pineapple buttercream, folding pineapple chunks into part of it for the filling, and tint the rest bright ocean blue with blue and turquoise food coloring. Stack the cakes with the pineapple filling, then frost the whole cake blue. Sprinkle crushed graham crackers in one corner to make a sandy beach, and decorate with tropical flowers and candy seashells for a festive luau look.
Jump to:
Why This Recipe Works
Click to see the technique science
- Triple pineapple flavor shines through. Pineapple in the cake, the filling, and the buttercream gives this cake a bright, tropical taste in every bite.
- The ocean-blue frosting is a showstopper. Tinting the buttercream a vivid turquoise instantly turns a simple sheet cake into a party centerpiece.
- Graham cracker sand adds the perfect detail. A corner of crushed graham crackers creates a realistic sandy beach that makes the whole design come together.
- A cake mix base keeps it approachable. Starting from a boxed white cake mix means even beginners can pull off this impressive-looking cake.
- Candy melt seashells are easy and cute. Molded candy melt seashells are simple to make ahead and add an adorable, polished finishing touch.
- It is a make-ahead party star. You can bake, frost, and decorate in stages, so it is manageable even for a big celebration.
Why You’ll Love This Recipe
- It is a showstopping tropical centerpiece with moist triple-pineapple flavor.
- The ocean-blue beach design looks impressive but is so much fun to make.
- It is perfect for luaus, summer parties, and birthdays, right alongside our lemon blueberry trifle.
Key Ingredients
Here is everything you need to make this festive triple pineapple luau cake. A boxed cake mix and a few simple extras make the tropical magic happen.
- White Cake Mix: The easy base for the cake. Pineapple extract stirred in adds that tropical flavor.
- Pineapple: Fresh or canned pineapple chunks are folded into the buttercream filling for bursts of fruit.
- Butter and Powdered Sugar: Beaten together with pineapple juice into a smooth, fluffy buttercream.
- Blue and Turquoise Food Coloring: The secret to that bright ocean-blue frosting. Gel colors give the most vivid shade.
- Graham Crackers: Crushed into crumbs to create the golden sandy beach in one corner.
- White Candy Melts: Melted and poured into molds to make easy candy seashells for decorating.
- Tropical Flowers and Toppers: Colorful flowers, candy seashells, and luau picks bring the beach scene to life.
See recipe card for exact quantities.
Variations and Substitutions
This luau cake is easy to customize for any tropical celebration. Here are a few favorite ways to switch it up.
- Make it a layer cake: Bake the batter in round pans and stack into a tall tiered ocean cake.
- Go pina colada: Add a little coconut extract to the cake and sprinkle toasted coconut in the sand.
- Use fresh flowers: Decorate with food-safe fresh tropical blooms instead of candy or paper flowers.
- Try a different flavor: Swap in a yellow or coconut cake mix, or make it an impressive layer cake style.
- Add a fondant palm tree: A simple fondant or chocolate palm tree makes the beach scene even more fun.
- Make cupcakes: Turn the batter into luau cupcakes with blue swirled frosting and tiny seashells.
How to Make Luau Cake
- Prepare the white cake mix according to the package, stirring in the pineapple extract, and bake in two pans. Let the cakes cool completely.
- Beat the butter, powdered sugar, and pineapple juice into a smooth buttercream, adding milk a little at a time if needed. Fold the pineapple chunks into about one third of the frosting for the filling.
- Tint the remaining frosting a bright ocean blue using two parts blue to one part turquoise food coloring, adjusting until you love the shade.
- Melt the candy melts and fill seashell molds, scraping the tops flat. Chill in the fridge until the candy is fully set.
- Level the cooled cakes, spread the pineapple filling between the layers, and stack them. Frost the entire cake with the blue buttercream.
- Sprinkle crushed graham crackers over one corner and side of the cake to create a sandy beach.
- Decorate with tropical flowers, the candy seashells, and luau cake toppers. Refrigerate until ready to serve.
Recipe Tips & Tricks
- Cool the cakes completely before frosting, or the buttercream will melt and slide.
- Use gel food coloring for the brightest ocean-blue without thinning the frosting.
- Make the candy seashells ahead; they need time to set and store well for days.
- Drain the pineapple well before folding it into the filling so the frosting does not get watery.
- Crumb coat first with a thin layer of frosting to lock in crumbs before the final blue coat.
- Add the graham sand last so it stays crisp and does not soak into the frosting.
- Refrigerate the finished cake if not serving within 30 minutes so the decorations hold.
Serving Ideas and Suggestions
This luau cake is the centerpiece of any tropical party, so serve it whole first to show off the ocean beach design before slicing. It is best at room temperature so the pineapple flavor and buttercream shine.
Pair it with other festive desserts like our lemon blueberry trifle or bright lemon lime angel food cupcakes for a colorful summer spread.
For a bigger celebration table, add a tray of lemon raspberry cake balls or a gooey chocolate earthquake cake so there is something for everyone.
Leftover cake keeps well covered in the fridge for a few days, so it is a great make-ahead dessert for a crowd.
Luau Cake FAQs
A luau cake is a tropical, Hawaiian-themed party cake, usually decorated to look like a beach or ocean scene. This version is a triple-pineapple cake frosted with bright blue ocean buttercream, with a golden graham cracker sand beach, candy seashells, and colorful flowers. It is a fun, festive centerpiece for summer parties and birthdays.
Yes, this cake is great to make in stages. Bake the cakes and make the candy seashells a day or two ahead. You can frost and decorate the morning of your event and keep it refrigerated. Let it come to room temperature before serving for the best flavor and texture.
Use gel food coloring rather than liquid, since gels give a vivid color without thinning the buttercream. A mix of about two parts blue to one part turquoise gives a beautiful ocean shade. Stir it in thoroughly, then add a little more a few drops at a time until you reach the color you want.
Candy melts poured into seashell silicone molds make easy edible seashells. You can also use store-bought candy shells, white chocolate, or fondant. For flowers, use food-safe artificial tropical flowers, fondant flowers, or candy. Luau cake toppers and picks are widely available around summer.
Absolutely. You can swap the boxed cake mix for your favorite homemade white or pineapple cake recipe. The decorating steps stay exactly the same. A cake mix just makes it faster and more foolproof, which is helpful when you are focusing your energy on the fun beach design.
Store leftover cake in an airtight container or tightly covered in the refrigerator for up to three to four days. The buttercream and pineapple filling need to stay chilled. The graham cracker sand will soften over time, so it is best enjoyed in the first day or two for that crunchy beach texture.
Planning a party? Wow your guests with our impressive spice layer cake next.
Triple Pineapple Luau Cake
Ingredients
- 1 cup cubed pineapple in juice
- 2 boxes white cake mix
- 3 egg whites
- 1/3 cup oil
- 1 1/4 cups water
- 1/4 teaspoon pineapple extract
- 1 1/2 cups unsalted butter
- 3 tablespoons pineapple juice
- 5 cups powdered sugar
- Milk as needed
- Americolor electric blue and turquoise gel food coloring
- 2 sheets of graham crackers crushed into crumbs
- White candy melts
Instructions
- Preheat oven to 350 degrees F. Butter and flour two 9″x13″ cake pans.
- Prepared cake mix according to package directions, adding pineapple extract after batter is mixed together.
- Pour cake batter into prepared pans, and back according to package directions. Remove cakes from oven and cool completely.
- In a large bowl, beat together butter, powered sugar, and pineapple juice until smooth and fluffy. Add milk (1 tablespoon at a time) if frosting is too dry. Add powdered sugar (1 to 2 tablespoons at a time) if frosting is too wet.
- Place 1/3 of the frosting in a separate bowl, and add the pineapple chunks to this frosting. Stir to combine.
- To the remaining 2/3 of the frosting add 2 parts electric blue food coloring to 1 part turquoise food coloring for a bright ocean blue color. I did 6 drops blue to 3 drops turquoise – adjust the colors as needed to your liking. Be sure to thoroughly stir the food coloring into frosting before adjusting colors.
- Melt candy melts according to package directions. Fill seashell molds with melted candy. Be sure to scraper the top of the mold to remove excess candy so the seashells have a flat back. Place mold in fridge while you assemble to cake, until the candy is set.
- Once cakes are cooled, take a serrated knife or cake saw and even out the layers. Place one layer on the cake board, and top with the pineapple chunk frosting. Spread evenly over the cake layer. Top filling with the other cake layer, putting the layer bottom side up. Frosting the entire cake with the blue frosting.
- choose one side of the cake to be the “beach” and sprinkle your graham crackers crumbs over that side and around the corners a bit to make the “sand.” Top cake with luau themed cake toppers and candy seashells.
- Place 2 flowers in the top opposite corner of the cake from the beach. Place 2 flowers in the bottom corner of the cake below the beach (as pictured). Use the ocean as your space to write any message you’re putting on the cake. Refrigerate if not serving within 30 minutes of finishing the cake.
Notes
Nutrition
Love This Recipe?
Follow @ThisSillyGirlsKitchen on Instagram and @danadevolk on Pinterest for more!
Oh dear. I hope you fixed the spelling of the birthday girl’s name before she got the cake.. 8-/
I love this cake! It reminds me of the luau themed cake my daughter had for her second birthday party!
Thank you for sharing on the Wake Up Wednesday link party! I hope you can join again next week!
Kate | TheOrganizedDream.com
This turned out so cute! Thank you for sharing with us at VMG’s Brag About It link party!