Sift together the flour, cornstarch and cocoa powder in a bowl. Grease a 26cm heart-shape spring form. Preheat the oven to 175C/350F.

面粉，淀粉和可可粉混合过筛到一个盆里。准备一个26厘米的心型蛋糕模。预热烤箱到175C/350F。