What is Blanch ?
Blanch is (verb) 1. to cook for a short time in boiling water Blanch the asparagus for two minutes. 2. to put fruit or vegetables in boiling water to remove the skin Blanch the tomatoes first. Almonds should be blanched before being roasted and salted. 3. to cover growing plants so that they become white Celery needs to be blanched by covering it with earth to get really white stems. 4. to turn white with shock or worry She blanched at the news.
source: Easier English, Student Dictionary Upper Intermediate Level