GENOISE
SPONGE CAKE
    Genoise Sponge Cake
 GENOISE SPONGE CAKE
    Ingredients                   Total weight: ~ 529 g        100%
•   Whole eggs                            230 g                 43%
•   Sugar                                  123 g                24%
•   Inverted sugar/honey                    15 g                3%
•   Sea salt                               1.5 g                <1%
•   All-purpose flour                      113 g                21%
•   Potato starch                          26 g                 5%
•   Butter 82%                             20 g                 4%
1. Put the eggs, which are at 40 °C / 104 °F, sugar, inverted sugar
   and sea salt into a bowl of a stand mixer. Whip at maximum speed
   with a whisk attachment for about 10 minutes until light and fluffy.
2. In a separate mixing bowl, combine the sifted flour and potato
   starch with a whisk and gradually add into the whipped mixture.
   Carefully fold in the dry ingredients with the whisk to keep
   maximum volume. Try to avoid incorporating the air bubbles.
3. Melt butter in a microwave oven to 45 °C / 113 °F. Mix it with a bit
   of the sponge cake batter using a whisk.
4. Pour the butter mixture into the rest of the sponge cake batter.
   Whisk everything again.
5. Place a cake ring d=18 cm and h=6 cm on a baking sheet lined
   with a silicone mat. Pour the cake batter into the ring.
6. Bake the sponge in the oven, preheated to 180 °C / 356 °F,
   for around 20–25 minutes. When ready, the sponge should be
   golden-brown and spring back when being pressed.
7. Let it cool down at room temperature.
8. Cut the sponge out of the cake ring with a knife and trim the top
   crust using a serrated knife.
9. Slice the sponge cake into three layers as desired.
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