What is Custard ?
Custard is (noun) 1. (egg) custard a sweet sauce, made with eggs and milk, flavoured with vanilla, baked until set and eaten warm or cold 2. (in the UK) a sweet yellow sauce made with milk and a powder containing cornflour stewed rhubarb and custard Would you like some custard with your crumble?
source: Easier English, Student Dictionary Upper Intermediate Level