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Ingredients :
7 egg yolks (蛋黄)
90ml corn oil(玉米油)
100ml milk (鲜奶)
90g (3/4 cup) plain flour(普通面粉)
2 tbsp corn starch (玉米粉)
1 1/2 tbsp instant coffee powder (即溶咖啡粉)
1/2 tsp coffee essence (咖啡香精)
7 egg whites (蛋白)
1/8 tsp salt (盐)
1tsp lemon juice (柠檬汁)
105g (1/2 cup ) caster sugar (细砂糖)