In Lights' song "Salt and Vinegar," the singer describes a tumultuous and intense relationship with someone who brings out both the best and the worst in them. The lyrics convey a sense of conflict and attraction, as the singer acknowledges the toxic nature of their connection while also finding a strange comfort in it. The metaphor of "salt and vinegar" is used to represent the bittersweet and volatile nature of their relationship, in which both parties bring out each other's fiery and intense personalities. The song captures the complex emotions and dynamics of a relationship that is both exhilarating and destructive, ultimately highlighting the irresistible pull of passion and intensity.