1/2 cup sugar
2-3 tablespoons hot water
1/2 cup flour
1/3 cup cornstarch
1 teaspoon baking powder（我用了1/2 Tsp）
酒糖液：1/4 杯的水和1 Tbsp的糖煮至溶解、冷却后加入1.5 Tbsp的朗姆酒，拌匀即可
1 cup whipping cream
1/2 cup blueberry juice
3/4 cup whole blueberries
1/4 cup sugar
1 1/2 packets unflavored gelatin
10 whole blueberries（随意）
1/3 cup blueberry juice
1 tbsp sugar
1 packet unflavored gelatin
1) Preheat the oven to 325°F. Separate the eggs. Beat egg whites with one third of the sugar until stiff. Beat egg yolks with remaining sugar and water until creamy（打发至6~7分，仍有些流动感）. Combine egg mixtures. Mix flour with cornstarch and baking powder and sift into the egg mousse; carefully stir in with whisk.
2) Line a 10″ springform pan with parchment paper. Fill in the batter and smooth it. Bake for about 15 to 18 minutes（时间视视自家的烤箱而定，直至竹签插入蛋糕体拔出无沾粘即可，我的烤箱烤20分钟左右）. Take it out of the oven and let cool. Remove cooled cake from the springform, remove parchment paper, and clean the springform.
3) You can cut the cake layer a little smaller if you want the mousse to cover the entire outside of the cake. Put the cake back into the springform（我用的是慕斯圈，直接将蛋糕片放在盘子上后，套上慕斯圈并调整圈的大小，稍比蛋糕大一圈；考虑到口感类似海绵蛋糕，组织会比较膨松、嫩爽，可在蛋糕表面刷上少许酒糖液，味道更滋润绵香，松软有弹性）.
4) Whip the cream until frothy and keep cool. Combine blueberry juice, blueberries and sugar in a saucepan. Heat the mixture until the sugar dissolves. Soak gelatin according to directions. Add into the warm blueberry juice and stir well.
5) Cool mixture indirectly over iced water just until it isn’t warm to the touch. Add 3 tablespoons of whipped cream and stir well. Add the juice mixture to the whipped cream and stir together carefully. Pour the mousse onto cake in the form. Smoothen the surface and refrigerate for at least 2 hours.
6) Arrange the whole blueberries on solidified mousse. Combine blueberry juice and sugar, then heat until the sugar is dissolved. Stir in gelatin that has been soaked according to directions.
7) Cool jelly mixture to room temperature before pouring onto mousse. Refrigerate for 20 minutes. With a wet, hot knife carefully loosen the springform ring from the cake. Transfer the cake to a serving plate （小心地松开慕斯圈即可）.