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Perfect Galaxy Mirror Glaze Chocolate Dome Cake

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A show-stopping chocolate dome cake with layers of decadent chocolate mousse and moist sponge, topped with a mesmerizing galaxy mirror glaze. Perfect for special occasions and celebrations.

Ingredients

Scale
  • 8 oz (225 g) dark chocolate (70% cocoa), finely chopped
  • 1 ½ cups (360 ml) heavy cream, cold
  • 2 gelatin sheets (or 1 tsp powdered gelatin), softened in cold water
  • 2 tbsp black cocoa powder
  • ¼ cup (50 g) sugar, fine granulated
  • ½ cup (65 g) all-purpose flour
  • 2 tbsp unsweetened cocoa powder
  • ½ tsp baking powder
  • 2 large eggs, room temperature
  • ⅓ cup (65 g) sugar
  • 3 tbsp (45 ml) vegetable oil
  • 1 tsp vanilla extract
  • ½ cup (120 ml) sweetened condensed milk
  • 7 oz (200 g) white chocolate, chopped
  • 3 gelatin sheets, softened
  • ½ cup (120 ml) water
  • ½ cup (150 g) glucose syrup (or light corn syrup)
  • Gel food coloring: dark blue, deep purple, black, and white (use sparingly)
  • Optional: edible glitter or star-shaped sprinkles

Instructions

  1. Prepare the Chocolate Sponge Base: Preheat oven to 350°F (175°C). Line a 6-inch (15 cm) round cake pan with parchment. Sift together ½ cup flour, 2 tbsp cocoa powder, and ½ tsp baking powder. Beat 2 eggs with ⅓ cup sugar until pale and fluffy (3-4 minutes). Fold in dry ingredients, then stir in 3 tbsp vegetable oil and 1 tsp vanilla extract. Pour batter into pan and bake 12-15 minutes until toothpick comes out clean. Let cool completely.
  2. Make the Chocolate Mousse: Soften 2 gelatin sheets in cold water for 5 minutes. Warm 2 tbsp cream in a saucepan, squeeze excess water from gelatin and stir into warm cream until dissolved. Chop 8 oz dark chocolate and place in heatproof bowl. Heat remaining cream (about 1 ¼ cups) to simmer and pour over chocolate; let sit 2 minutes, then stir until smooth. Add gelatin mixture and 2 tbsp black cocoa powder, whisk to combine. Let cool to room temperature but still pourable. Whip 1 ½ cups cold crea…
  3. Assemble the Dome: Place silicone dome mold on baking sheet. Spoon half mousse into mold, smooth surface. Cut sponge cake to fit dome and press into mousse. Cover with remaining mousse and smooth top. Freeze dome at least 4 hours or overnight until firm.
  4. Prepare the Galaxy Mirror Glaze: Soften 3 gelatin sheets in cold water. In saucepan, combine ½ cup water, ½ cup glucose syrup, and ½ cup sweetened condensed milk. Heat to just boiling, remove from heat, add softened gelatin (squeeze out water first). Pour mixture over 7 oz chopped white chocolate and let sit 2 minutes. Stir until smooth. Divide glaze into four bowls. Dye each with gel food coloring: dark blue, deep purple, black, and leave one white.
  5. Create the Galaxy Effect: Cool glaze to about 90°F (32°C). Place frozen dome on wire rack over tray. Starting with black glaze, pour thin layer over dome, rotating it. Quickly add spots of blue, purple, and white glaze in random swirls to mimic galaxy. Let excess glaze drip off. Transfer cake to serving plate and refrigerate until glaze sets, about 20 minutes.
  6. Finishing Touches: Optionally sprinkle edible glitter or star-shaped sprinkles. Slice carefully with hot knife for clean cuts.

Notes

Glaze should be poured at about 90°F (32°C) for best shine. The dome must be frozen before glazing to get a crisp mirror finish. Use a hot knife dipped in hot water and wiped dry for clean slicing. Strain glaze to avoid air bubbles. Work quickly as glaze sets fast. Gel food colors blend better and give vibrant hues. For gluten-free, substitute almond flour for sponge and gluten-free baking powder. For dairy-free, use coconut cream and dairy-free chocolate. Agar-agar can replace gelatin but glaze will be less shiny.

Nutrition

Keywords: galaxy mirror glaze, chocolate dome cake, chocolate mousse, mirror glaze cake, special occasion dessert, show-stopping cake

Find it online: https://zoeplate.com/perfect-galaxy-mirror-glaze-chocolate-dome-cake-recipe-for-special-occasions/