Preheat oven to160 C/325 F . Beat egg whites until frothy, add salt, lemon juice and extracts. Add sugar a little at a time; continuebeating until whites are glossy and stiff.

• 预热烤箱到160C/25f。把蛋白打至粗泡，加入食盐，柠檬汁和香精。然后慢慢加入砂糖，每次加入少许，继续搅打至蛋白呈现干性发泡。