to briefly boil (a vegetable etc), then dress with soy sauce, oil, vinegar etc / to briefly stir-fry (meat, chopped spring onions etc), then add to other ingredients and cook further
添油加醋
tiān yóu jiā cù
lit. to add oil and vinegar / fig. adding details while telling a story (to make it more interesting)
油盐酱醋
yóu yán jiàng cù
(lit.) oil, salt, soy sauce and vinegar / (fig.) the trivia of everyday life
boiled noodles served without broth, topped with just a sprinkle of oil and some chopped spring onions, to which customers add vinegar, soy sauce or chili oil according to their taste