巧克力蛋糕配方

"苦甜巧克力 120g","无糖可可粉 30g","无盐奶油 30g","细砂糖 20g(蛋黄用)","细砂糖 40g(蛋白霜用)","低筋面粉 40g","蛋 3颗","微糖豆浆 80cc","白醋 1/2茶匙(2.5cc)"