Pisces Sheet Cake Ocean (Printable Version)

Vanilla sponge layered with blue ombré buttercream shaped into ocean waves and sea foam accents.

# Ingredient List:

→ Cake

01 - 2 1/2 cups all-purpose flour
02 - 2 1/2 teaspoons baking powder
03 - 1/2 teaspoon salt
04 - 1 cup unsalted butter, room temperature
05 - 1 3/4 cups granulated sugar
06 - 4 large eggs, room temperature
07 - 1 tablespoon pure vanilla extract
08 - 1 cup whole milk, room temperature

→ Buttercream Frosting

09 - 1 1/2 cups unsalted butter, room temperature
10 - 5 cups powdered sugar, sifted
11 - 2 teaspoons pure vanilla extract
12 - 1/4 cup whole milk, room temperature
13 - Blue gel food coloring in various shades
14 - White gel food coloring

→ Decoration

15 - Edible pearls or sugar pearls, optional
16 - White chocolate or fondant for Pisces symbol, optional

# How to Make:

01 - Preheat oven to 350°F. Grease and line a 9x13-inch sheet cake pan with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt until evenly distributed.
03 - In a large bowl, beat butter and sugar on medium speed until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, mixing well after each addition. Beat in vanilla extract until fully combined.
05 - Alternately add flour mixture and milk to the butter mixture, beginning and ending with flour. Mix on low speed until just combined.
06 - Pour batter into prepared pan and smooth the top. Bake for 28 to 32 minutes, or until a toothpick inserted in the center comes out clean.
07 - Cool cake in pan for 10 minutes, then transfer to a wire rack to cool completely before frosting.
08 - Beat butter on medium speed until creamy, about 2 minutes. Gradually add powdered sugar on low speed. Add vanilla and milk; beat until fluffy and smooth.
09 - Divide buttercream into 3 to 4 bowls. Tint each with varying shades of blue, from deep ocean blue to pale aqua, and leave one portion white.
10 - Spread a thin layer of white buttercream over the entire cake as a crumb coat. Chill for 20 minutes until set.
11 - With an offset spatula, layer blue buttercreams in wave-like shapes across the cake, starting with the darkest shade at the base and working up to the lightest. Use swooping motions to mimic ocean waves.
12 - Pipe or swirl white buttercream on top to create sea foam effect.
13 - Optional: Decorate with edible pearls and add a Pisces symbol made from white chocolate or fondant.

# Expert Suggestions:

01 -
  • The vanilla sponge stays impossibly soft for days, which means you can actually make this ahead without it turning into cardboard.
  • Those blue waves are easier to create than they look, and somehow they make people gasp when you bring it to the table.
  • It feeds twelve people, scales down easily, and tastes just as good at room temperature as it does straight from the fridge.
02 -
  • Room temperature ingredients are not a suggestion—they're the difference between smooth batter and broken, grainy batter that tastes fine but looks sad.
  • Gel food coloring is mandatory if you want vibrant blues without turning your frosting into soup, which I learned by ruining my first attempt with liquid coloring.
  • Chilling the cake between decorating steps keeps your frosting lines sharp and makes the whole project feel less like controlled chaos.
03 -
  • If your frosting breaks or looks grainy, add a tablespoon of milk and beat it on medium speed for a minute—often it smooths right back out like magic.
  • Pipe your waves in the same direction repeatedly instead of switching directions constantly, which looks more cohesive and less like abstract frosting anxiety.
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