 The fat is trimmed off, and the cleaned "gopchang" is soaked in water to remove any traces of blood.Garlic, ginger, onion, cooking wine, black pepper, and Korean pepper are common marinating ingredients, mainly used for eliminating any unpleasant odors and tenderizing the meat of "gopchang".Ingredients for "gopchang-gui" marinade are juiced, rather than minced, so that they don't burn during the grilling process.