Portal Chocolate Raspberry Cake

My kids have been experimenting playing some games that either are new to them or they have not played in a while. Portal became the recent obsession for both of them and they played it what seemed like non stop until they completed the game. Both Portal and Portal 2 are available on Steam. My oldest really wanted me to create the cake from the game so here we have the Portal Chocolate Raspberry Cake. Some people interpret the cake as black forest but we decided on raspberry instead of cherry.

In the game the cake is used to motivate the Test Subjects to continue through the tests, but as we proceed through the game we learn that “the cake is a lie” and there will be no cake as reward. Since we’ve made the cake, “the cake is NOT a lie!”

Portal Chocolate Raspberry Cake

The cake does take a bit of time and a number of steps to create, but the end result is a beautiful and tasty cake you will be proud to serve to Portal game fans and those that have never heard of the game. If you like chocolate, you are going to love this cake. The hardest step is getting all those chocolate jimmies to stick to the cake, but it is easier than you think and just takes a soft touch to patting them into the frosting all around the cake. Be sure to put parchment under the cake before frosting to make it easier to clean up once decorating is complete.

Portal Chocolate Raspberry Cake
Portal Chocolate Raspberry Cake

Portal Chocolate Raspberry Cake Recipe

Portal Chocolate Raspberry Cake

Portal Chocolate Raspberry Cake

Yield: 12 servings
Prep Time: 40 minutes
Cook Time: 25 minutes
Total Time: 1 hour 5 minutes

Stunningly beautiful and sinfully delicious Portal Chocolate Raspberry Cake inspired by the video game, Portal. "The cake is NOT a lie."


Chocolate Cake

  • Devils Food Chocolate Cake Mix
  • Ingredients to make the cake according to the box

Raspberry Filling

  • 1 1/2 cups frozen raspberries
  • 1 Tbsp. cornstarch
  • 2 tsp. lemon juice
  • 1/4 cup sugar

Chocolate Buttercream Frosting

  • 8 oz. semi-sweet chocolate chips
  • 6 cups confectioners' sugar
  • 16 Tbsp. (2 sticks) butter
  • 6 Tbsp. milk, plus more, if needed
  • 2 tsp. vanilla extract
  • ¼ tsp. salt


  • 8 oz. tub Chocolate Jimmies
  • 9 fresh raspberries
  • 2 Tbsp. red currant jelly
  • 1 can of whipping cream or small batch vanilla buttercream frosting (frosting holds up better)
  • 1 white candle


Chocolate Cake

  1. Make the cake in two 9-inch layers

Raspberry Filling

  1. Combine the frozen raspberries, cornstarch, lemon juice and sugar in a medium sauce pan over medium high heat, stirring occasionally till boiling.
  2. Decrease the heat to medium and stir constantly until everything is dissolved and liquid.
  3. You will see that the raspberries break down completely. Once the mixture has changed color to a deep dark red, remove from the heat and let it cool completely.

Chocolate Buttercream Frosting

  1. Have all the ingredients at room temperature.
  2. Put the chocolate in the top pan of a double boiler set over but not touching simmering water in the bottom pan. Stir until the chocolate is melted and smooth. Let cool to room temperature.
  3. In the bowl of an electric mixer fitted with the flat beater, combine the confectioners' sugar, butter, the 6 Tbs. milk, the vanilla and salt andbeat on low speed until combined, about 1 minute. Stop the mixer and scrape down the sides of the bowl. Increase the speed to medium and beat for 2 minutes, then reduce the speed to low. Add the chocolate and beat until combined, then increase the speed to medium and beat for 1 minute more.
  4. If the frosting is dry, add more milk, 1 tsp. at a time, until it is creamy but still holds peaks.

Assembling the Cake

  1. Prepare the cake as directed on the box in two 9-inch pans. Cool completely.
  2. Prepare the filling while the cake is baking and cool completely.
  3. Prepare the frosting when ready to assemble the cake.
  4. Melt red currant jelly in microwave for 20 seconds. Dip fresh raspberries completely and then put them into the fridge to set up.
  5. Place bottom cake layer on the serving plate. Pipe a ring of frosting around the outside edge. This is to keep the filling in the center of the cake.
  6. Fill the cake with the Raspberry filling and spread until it is level.
  7. Place the top layer of cake over the bottom layer. Frost the entire cake.
  8. Using your hands, press the chocolate jimmies into the frosting all around the cake and on top.
  9. Using a decorators bag, pipe eight dollops of whipped cream or vanilla buttercream frosting (frosting holds up better).
  10. Place one glazed raspberry onto each of the dollops.
  11. When ready to serve, add one white candle to the center of the cake.
Nutrition Information:
Yield: 12 Serving Size: 1
Amount Per Serving: Calories: 504Total Fat: 14gSaturated Fat: 8gTrans Fat: 0gUnsaturated Fat: 5gCholesterol: 14mgSodium: 106mgCarbohydrates: 95gFiber: 4gSugar: 85gProtein: 3g

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Portal Chocolate Raspberry Cake
Portal Chocolate Raspberry Cake

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