custard: [15] A custard was originally a pie, which took its name from its ‘crust’ (Anglo- Norman *crustade, the source of the word, was a derivative of Old French crouste, from which English got crust). The earliest English form was crustade, and intermediate spellings crustarde and custade occur. The reference in the name is to the pie’s pastry shell, not to its lid, for it had none: it was an open pie, of meat or fruit, filled up with stock or milk. This liquid was often thickened with eggs, and by around 1600 the term had moved across to name a dish in its own right made of eggs beaten into milk and cooked. => crust
custard (n.)
mid-14c., "meat or fruit pie," crustade, from Middle French croustade (Modern French coutarde), from Old Provençal croustado "fruit tart," literally "something covered with crust," from crosta "crust," from Latin crusta (see crust (n.)). Modern meaning is c. 1600. Spelling change perhaps by influence of mustard.
中文解释
1. crust => crust + -ade => crustade (literally "something covered with crust") => custard.2. Spelling change perhaps by influence of mustard.3. 卡仕达酱（custard cream）是烘焙届的万能酱，是蛋、奶、糖和香草的完美结合。4. 奶黄（Custard）也称为卡士达、吉士、蛋奶冻、蛋浆，泛指鸡蛋与牛奶混合后加热而凝固而成的食品，大多数是应用于制作甜品。
实用例句
1. Blend a little milk with the custard powder to form a paste.
往蛋奶沙司粉里加入一点儿牛奶，搅成糊糊。
来自柯林斯例句
2. Stir the custard occasionally to prevent a skin forming.