METHOD
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sponge cake
In a bowl, whisk together the egg, sugar, and milk. Once the ingredients are combined, add the drinkable yogurt, flour, cocoa powder, baking powder, a pinch of salt, and baking soda. Whisk again, and once everything is well incorporated, add the oil and mix thoroughly.
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bake in the skillet
Lightly grease a 24 cm (9.5-inch) frying pan (for example, Tefal Excellence+)—using cooking spray oil works best. Cut a circle of parchment paper to fit the bottom of the pan, then pour the cake batter into it. In a larger 28 cm (11-inch) pan (such as Tefal Excellence+), pour in some water and place it over medium heat (about 320–350°F / 160–175°C). Once the water is gently simmering, place the smaller pan with the cake batter inside the larger pan. Cover with a lid and cook over medium heat at a gentle simmer for 50–60 minutes. During cooking, add more water about twice as needed.
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chocolate topping
In a saucepan, bring the heavy cream to a boil. Finely chop the chocolate and place it in a bowl. Pour the hot cream over the chocolate and let it sit for 5 minutes, then stir until smooth. Add the butter and mix until a glossy, smooth ganache forms.
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serve
Check if the cake is done by inserting a toothpick into the center—it should come out clean. Let the cake rest in the pan for 5–10 minutes, then carefully invert it onto a plate by placing the plate over the pan and flipping it over. Allow the cake to cool to room temperature, then pour the chocolate ganache over it and decorate as desired with fresh fruit or any other toppings you like.