Clabber is a type of food made from SOUR milk that has been allowed to COAGULATE and CURDLE. It is a traditional Southern dish that is often served with sugar or molasses. The term clabber is derived from the Old English word 'clæfre' which means 'clotted cream'. COAGULATE, SOUR, and CURDLE are all words that describe the process of making clabber. COAGULATE means to cause a liquid to thicken and form a jelly-like mass, SOUR means having an acidic taste, and CURDLE means to cause a liquid to separate into solid particles.