an edible aquatic plant with oval leaves and dark red flowers

(idiom) a longing for the tastes of home; homesickness; the desire to resign from office and return to one's hometown

(idiom) a longing for one's hometown or a desire to retire from public office to go home, literally "watershield soup and perch slices" (delicacies from the Suzhou region)

homesickness for one's native place, referring to a story about a man who longed for the watershield soup and perch of his hometown