Oily fish, such as mackerel, are strong-flavored and pair well with boldly seasoned glazes made from gochujang chile paste. The red, rich paste is so common in korea that it is sold in virtually every supermarket in plastic containers ranging in size from about 2 cups to about 2 quarts. Normally the main ingredients are fermented soybeans ground with red chiles and powdered rice, plus a little salt and sweetener.