I can still remember the first time I saw this cake at a family potluck. Its pale green color was so intriguing, and one bite was all it took to get me hooked. This Pineapple Pistachio Cake, often known by its retro name “Watergate Cake,” is a vintage recipe that has truly stood the test of time. It’s an incredibly moist and flavorful sheet cake that starts with a simple cake mix, but the final result tastes anything but ordinary. The combination of nutty pistachio, sweet and tangy crushed pineapple, and a light, cloud-like pudding frosting creates a dessert that’s refreshing, unique, and impossible to resist.
Why make this recipe
If you’re looking for a dessert that’s guaranteed to be a hit with minimal effort, this is it. Here’s why this Pineapple Pistachio Cake deserves a spot in your recipe rotation:
- Incredibly Easy: This recipe uses a box of cake mix and instant pudding, which does most of the heavy lifting for you. It’s a “dump and mix” style cake that’s perfect for bakers of all skill levels.
- Super Moist: The secret to the unbelievably moist crumb is a full can of undrained crushed pineapple mixed right into the batter. It ensures the cake stays tender and delicious for days.
- Crowd-Pleasing Flavor: The unique blend of sweet pineapple and nutty pistachio is a delightful surprise that always gets rave reviews. It’s a perfect dessert for parties, holidays, and potlucks.
- Perfect for Any Occasion: Its festive green hue makes it a natural fit for St. Patrick’s Day or Easter, but its refreshing taste is welcome at summer barbecues and family gatherings all year long.
Ingredients
- 1 box (15.25) yellow cake mix
- 1 box (3.4 oz) instant pistachio pudding mix
- 1/2 cup vegetable oil
- 3 large eggs
- 1 can (20 oz) crushed pineapple (do not drain)
- 3/4 cup half and half milk
- 1/2 cup heavy cream
- 1 box (3.4 oz) instant pistachio pudding mix
- 8 oz Cool Whip (thawed)
- chopped pistachios (optional for topping)
How to make Pineapple Pistachio Cake
Making this cake is a two-part process: baking the incredibly moist cake and then whipping up the light and creamy frosting. Let’s get started!
Step 1: First, preheat your oven to 350°F. Generously spray a 9×13 inch cake pan with nonstick cooking spray and set it aside for later.
Step 2: In a large mixing bowl, combine the dry yellow cake mix, one box of the instant pistachio pudding mix, vegetable oil, eggs, and the entire can of crushed pineapple—juice and all! Do not drain the pineapple, as the liquid is essential for a moist cake.
Step 3: Using an electric hand mixer or a stand mixer fitted with the paddle attachment, beat the ingredients on medium-high speed for about 1 to 2 minutes. You want the batter to be smooth and thoroughly combined.
Step 4: Pour the batter into your prepared 9×13 pan and use a spatula to spread it into an even layer, making sure it reaches all the corners.
Step 5: Bake for 35-40 minutes. You’ll know it’s done when a toothpick inserted into the center comes out clean and the cake edges have just started to pull away from the sides of the pan.
Step 6: Carefully remove the cake from the oven and place it on a wire rack to cool completely. This will take about an hour. It’s very important that the cake is at room temperature before you add the frosting.
Step 7: While the cake cools, you can make the frosting. In a separate large bowl, whisk together the half and half, heavy cream, and the second box of instant pistachio pudding mix. Continue whisking until it’s well combined and begins to thicken. Let this mixture sit for about 5 minutes to allow the pudding to set and thicken further.
Step 8: Gently fold the thawed Cool Whip into the thickened pudding mixture. Stir until everything is smooth and evenly combined. Try not to overmix, as you want to keep the frosting light and airy.
Step 9: Once the cake is completely cool, spread the pistachio pudding frosting evenly over the top. While you can serve it immediately, the cake is best after chilling. Cover the pan and refrigerate for at least 2 hours (or up to overnight) to let the flavors meld and the frosting set. Just before serving, sprinkle with chopped pistachios for a beautiful finish and a bit of crunch.
How to serve Pineapple Pistachio Cake
This cake is best served chilled, straight from the refrigerator. The cold temperature firms up the frosting and enhances the refreshing quality of the pineapple. Cut it into squares and serve it directly from the 9×13 pan for easy cleanup at parties and potlucks. A sprinkle of chopped pistachios right before serving adds a lovely crunch and a pop of color that hints at the flavor inside. It’s a complete dessert on its own and doesn’t need anything else to shine!
How to store Pineapple Pistachio Cake
Due to the Cool Whip and dairy in the frosting, this cake must be stored in the refrigerator. Keep it tightly covered with a lid or plastic wrap. It will stay fresh and delicious for up to 4 days, though the texture is best within the first 2-3 days. In fact, many people think it tastes even better on the second day!
You can also freeze this cake. For best results, freeze individual slices on a baking sheet until firm, then wrap each slice in plastic wrap and place them in a freezer-safe bag. It will keep for up to 2 months. To serve, simply thaw a slice in the refrigerator for a few hours.
Tips to make
- Don’t Drain the Pineapple: I can’t stress this enough! The juice from the crushed pineapple is the key ingredient that makes this cake exceptionally moist and flavorful.
- Ensure the Cake is Cool: Be patient and let the cake cool completely to room temperature before frosting. Applying frosting to a warm cake will cause it to melt into a soupy mess.
- Chill Before Serving: Chilling the cake for at least 2 hours is highly recommended. This step allows the pudding frosting to set fully and the flavors to meld together, resulting in a more delicious and cohesive dessert.
- Go for a Bolder Green: If you want a more vibrant green color for St. Patrick’s Day, feel free to add a drop or two of green food coloring to both the cake batter and the frosting.
FAQs About Pineapple Pistachio Cake
- Why is this cake called Watergate Cake?
- The exact origin is a bit of a mystery, but the most popular theory is that the cake became popular around the time of the 1970s Watergate scandal. The name was a tongue-in-cheek reference, with the frosting being the “cover-up” and the pistachios being the “nuts” involved in the whole affair.
- Can I use homemade whipped cream instead of Cool Whip?
- While you can, Cool Whip (or another stabilized whipped topping) is recommended for this recipe. It provides a specific light texture and stability that holds up well in the refrigerator for several days. Homemade whipped cream can become watery and won’t hold its shape as long.
- Can I make this cake ahead of time?
- Absolutely! This is a fantastic make-ahead dessert. You can bake the cake, let it cool, and store it tightly covered at room temperature a day in advance. Alternatively, you can fully assemble and frost the cake and let it chill in the refrigerator overnight. It tastes even better the next day!
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Final Thoughts
There’s a reason this Pineapple Pistachio Cake has been a potluck staple for decades. It’s the perfect marriage of simplicity and show-stopping flavor. The moist, pineapple-infused cake paired with the cool, creamy pistachio frosting creates a dessert experience that is both nostalgic and excitingly different. Whether you call it Watergate Cake or simply delicious, it’s a recipe that’s sure to bring smiles and requests for a second slice.
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Easy Pineapple Pistachio Cake
- Total Time: 5 hours 45 minutes
- Yield: 15 servings 1x
- Diet: Vegetarian
Description
An easy-to-make, moist pineapple pistachio cake made with cake mix and instant pudding, topped with a creamy, light pistachio frosting.
Ingredients
For the Pineapple Pistachio Cake:
1 box (15.25) yellow cake mix
1 box (3.4 oz) instant pistachio pudding mix
1/2 cup vegetable oil
3 large eggs
1 can (20 oz) crushed pineapple, undrained
For the Pistachio Pudding Frosting:
3/4 cup half and half milk
1/2 cup heavy cream
1 box (3.4 oz) instant pistachio pudding mix
8 oz Cool Whip, thawed
chopped pistachios (optional for topping)
Instructions
- Step 1: Preheat your oven to 350°F and spray a 9×13 inch cake pan with nonstick spray.
- Step 2: In a large mixing bowl, combine the yellow cake mix, one box of instant pistachio pudding mix, vegetable oil, eggs, and the undrained can of crushed pineapple.
- Step 3: Using an electric mixer, beat the ingredients on medium-high speed for 1-2 minutes until everything is thoroughly combined.
- Step 4: Pour the batter into the prepared cake pan and spread it out evenly.
- Step 5: Bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean and the cake edges pull away from the sides of the pan.
- Step 6: Remove the cake from the oven and allow it to cool completely on a wire rack for about 1 hour.
- Step 7: To make the frosting, whisk together the half and half, heavy cream, and the second box of instant pistachio pudding mix in a large bowl until it begins to thicken. Let it sit for 5 minutes to set further.
- Step 8: Gently fold the thawed Cool Whip into the pudding mixture until it is fully combined.
- Step 9: Spread the frosting evenly over the top of the cooled cake.
- Step 10: Cover the cake and refrigerate for at least 2-6 hours before serving for the best flavor and texture. Garnish with optional chopped pistachios just before serving.
Notes
For the best results, ensure the cake is completely cool before adding the frosting.
Refrigerating the cake for at least a few hours is highly recommended as it enhances the flavor and texture.
The cake can be made a day ahead and refrigerated overnight.
- Prep Time: 10 minutes
- Cook Time: 35 minutes
- Category: Dessert
- Method: Bake
- Cuisine: American