Gyeojaman
Korean mustard, korean mustard sauce, 겨자소스, 겨자
Korean 겨자소스, or mustard sauce, is a condiment that often accompanies various Korean dishes to add a sharp, spicy flavor. 겨자, or mustard, in Korean cuisine, refers to the mustard seed or powder used to make this sauce, which can range from mild to intensely hot depending on preparation.
Recipes

Cold salad with spicy mustard sauce (Gyeoja Naengchae) recipe by Maangchi
Have you ever tasted a traditional Korean cold salad, called naengchae in Korean? Whenever I make this style of salad, I use a spicy mustard sauce or a garlic sauce as a dressing. I'll show you the garlic sauce someday, but in this this recipe Korean...