To what does Eliezer compare the two cauldrons of soup?

Each of the "tales" in geoffrey chaucer's poem the canterbury tales are told by a different pilgrim on a journey to the city of canterbury. the poem has a large story (pilgrims going to canterbury) that encloses all the "little stories" or tales the pilgrims tell. which best describes the type of structure chaucer is using in his poem?