方子来源是个法国人，纽约名厨，Jean-Georges Vongerichten
他的书： Home Cooking with Jean-Georges
这个方子的用料是半条黄油，半杯糖，3只鸡蛋，半杯杏仁粉，3.2盎司的巧克力，还有，只需要一茶匙的面粉。
这么点原料能整出个蛋糕来。
若是用xylitol代替糖的话，还可以算是一个低碳低糖的甜点。
主要是非常的香，巧克力的浓郁加上杏仁的香，又简单易做。这是适合大人吃的比较sophisticated的巧克力蛋糕，没有icing的，最后是在上面撒一层可可粉。
材料：
4 tablespoons (1/2 stick) unsalted butter, plus more for pan
1 tablespoon all-purpose flour, plus more for pan （我觉得这一茶匙的面粉不要省，里面的面筋帮助蛋糕组织）
3 large eggs, separated
3 1/2 ounces bittersweet chocolate (66% cacao) （我用超市买的Guittard 牌子或者Ghirardelli Chocolate Baking Chips, 60% Cacao Bittersweet Chocolate，bittersweet的比semisweet的含糖量低一些）
1/2 cup sugar （这个可以用xylitol代替，1：1 对换）
1/2 cup almond flour
Dutch-process cocoa powder, for dusting (optional)
DIRECTIONS：
STEP 1
Preheat oven to 350 degrees. Butter and flour an 8-inch round fluted tart pan with a removable bottom or a springform pan, tapping out excess.（或者在底部放一张圆形的parchment paper，便于脱模，模具边上一定要涂油扑粉防粘）
STEP 2
In the bowl of an electric mixer fitted with the whisk attachment, whisk together egg whites and about 1／2 of the sugar until medium-stiff peaks form. （打蛋白霜，加1／4 tsp或1／2 tsp白醋，先打一会儿，然后慢慢把糖一点点边打边加入）
STEP 3
Meanwhile, melt chocolate and butter in a large heatproof bowl set over (but not touching) simmering water, stirring occasionally until smooth. Remove from heat.
STEP 4
Add 1 yolk to chocolate mixture and beat to combine. Add remaining yolks and mix to combine. Add the rest of sugar, almond flour, and all-purpose flour; mix until combined. Add 1/3 of the egg white mixture and mix to loosen chocolate mixture. Gently fold in remaining egg white mixture. （最后这一步，把蛋白霜和巧克力蛋黄糊混合时要有点技巧：先把1／3蛋白霜混进去，这时不要怕消泡，要拌匀，巧克力蛋黄糊稀一点了，然后接下来的蛋白霜混进去时，要快速从底下拌，这时要注意避免消泡，不要过度搅拌。和做戚风蛋糕一样的技术）。
STEP 5
Transfer to prepared cake pan and evenly spread. Transfer cake pan to oven and bake until puffed and knife inserted into the center comes out clean, about 17 minutes （看自己的烤箱可能需要稍微调整）. Transfer pan to a wire rack and let cool 10 minutes. Invert cake onto wire rack. Carefully re-invert and let cool completely. Dust with cocoa powder, if desired.
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