Preppers Diet Food Yongsan is a salad and diet food restaurant near Yongsan Station in Seoul. The beef steak is moist and tender, and the beef Cobb plate and beef plate salad include various vegetables and meat for a filling meal. Nutrition information is laid out, and menu items come out quickly, which suits choosing a workout diet or eating alone at Yongsan Station. Curry rice, rose pasta, and yogurt are also on the menu, giving a wide range of choices.