You’ve seen the videos. You know the pink box. The ubiquitous, dare I say infamous, overly sweet, 800-calorie Crumbl cookie that dominates TikTok taste tests. At La Usuluteca in Arlington Heights, the trend inspired something far more authentic. La Usuluteca’s signature blue box holds the month’s selection of handmade Salvadoran pan dulce, part of the bakery’s monthly “drop” series.