《老姑婆的古董老菜单》是一个“在追寻根源的过程中找回自信”的故事。自己的根，就是自己最大的靠山。无论在落魄、失意、丧志的时候，只要找回自己的根源，就能找回自己的自信。让大稻埕的一勺汤、一口菜，带你找回血脉里不败的价值。

熱衷歷史、喜愛老古董的王梧安（李冠毅 飾）頂下原本打工的咖啡店，他希望咖啡店能成為藝文同好的聚集地，沒想到卻被老闆騙走了百萬創業基金，萬念俱灰的他在高中同學張瓊蕙（黃聖雅 飾）的提議下，意外向老管家 廖阿水（龍劭華 飾）承租了大稻埕林家古厝一樓，重啟爐灶經營起「LIM Kafe珈琲館」...

A young man returned to his hometown to open a coffee shop in the old district. Not long after, the heiress of the building that housed his shop also returned home with every intention of selling the property to fund her boyfriend's business venture. Thankfully, her plan was thwarted when the executor of her great aunt's will/ caretaker of the property demanded that she fulfilled three missions with the young man before he would grant her request. The missions took them on an adventure where they discovered the town's history and the people who lived there. In the process, the heiress also discovered her love for her great aunt's hometown.