“I’ve been making this cake since 1973 it is so delicious!!! I have to make two at one time because one is gone within a day.”
This is the recipe for the legendary 1970s Pistachio Pudding Cake (often called “Watergate Cake” or “Pistachio Inside-Out Cake”). In 1973, this was the height of “convenience baking” — a movement that used instant pudding mix to create a texture so moist and dense it rivaled professional pound cakes.
The chemical interaction between the pudding’s starch and the cake mix’s leavening is what creates that signature “velvet” crumb and bright, retro-green interior.
The Ingredient Profile
The Cake Base
- 1 box (15.25 oz) White or Yellow Cake Mix.
- 1 box (3.4 oz) Instant Pistachio Pudding Mix (do not use sugar-free).
- 3 Large eggs.
- 1 cup Club Soda or Seltzer (the carbonation provides the “lift” for the heavy pudding).
- 1 cup Vegetable oil.
- ½ cup Chopped walnuts or pistachios (optional, for the “crunch”).
The “Dream” Frosting
- 1 box (3.4 oz) Instant Pistachio Pudding Mix.
- 1 envelope (1.3 oz) Dream Whip (whipped topping mix) or 1 cup heavy cream.
- 1 ½ cups Cold whole milk.
The Method
1
The Fizz Factor
Preheat oven to 350°F (175°C)
In a large bowl, combine the dry cake mix and one box of pudding mix. Add the eggs, oil, and club soda. Whisk just until smooth — the fizzing reaction is what ensures a light texture.
2
The Fold
Add the texture
Fold in your chopped nuts. Pour the batter into a well-greased and floured Bundt pan or a 9×13-inch baking dish.
3
The Bake
40–45 minutes
Bake until a toothpick inserted in the center comes out clean. Let the cake cool completely before frosting. Because of the pudding, this cake is fragile while warm.
4
The Retro Frosting
High-speed whip
In a chilled bowl, beat the second box of pudding mix, milk, and Dream Whip (or cream) on high speed for 4–5 minutes until it forms stiff, mousse-like peaks. Spread generously over the cooled cake.
Three Secrets for a 1973 Classic
The Club Soda Rule: Never use flat soda. The bubbles are essential to counteract the weight of the pudding mix. If you don’t have soda, you can use ginger ale for a subtle spiced kick.
- Freshly Shredded Coconut: For an authentic 1970s “Watergate” flavor, fold ½ cup of sweetened shredded coconut into the frosting. It adds a chewy texture that balances the creamy pudding.
- The Cooling Rack: Do not frost this cake while it is even slightly warm. The pudding-based frosting is heat-sensitive and will melt into a glaze rather than staying fluffy.
- The Overnight Perk: This cake actually tastes better on Day 2. The moisture from the frosting seeps slightly into the top layer of the cake, creating a “melt-in-your-mouth” consistency that explains why people have been making it for 50 years.
