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Ingredients for cake :
4 egg yolks 蛋黄
1 egg 全蛋
20g caster sugar 细砂糖
1/8 tsp salt盐
1/2 tsp coffee essence 咖啡香精
2 tsp instant coffee powder 即溶咖啡粉
2 tsp hot water 热水
60g corn oil 玉米油
60ml milk 鲜奶
100g plain flour普通面粉
10g corn flour 玉米粉

4 egg whites 蛋白
80g caster sugar 细砂糖

Coffee buttercream 咖啡牛油糖霜:
200g butter牛油
80g icing sugar 糖粉
1 tbsp instant coffee powder 即溶咖啡粉
1 tbsp hot water 热水
1/4 tsp coffee essence咖啡香精