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#### Ingredients
**For the Sponge Cake:**
- 50 g butter
- 4 eggs (size M)
- 200 g sugar
- 5 tbsp hot water
- 1 tsp lemon zest
- 1 tsp vanilla extract
- 120 g wheat flour (type 405)
- 40 g cornstarch
- 1 tsp baking powder
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