忆 (w)

(yì) to recollect; to remember; memory

忆苦思甜 (w)

(yìkǔsītián) to view one's past as miserable and one's present as happy (idiom)

忆苦饭 (w)

(yìkǔfàn) unsavory meal taken in remembrance of past hardships; fig. poor-tasting meal