hop Suey had a meteoric rise (blue line) in popularity from 1900 to about 1940, after which it drops rapidly and leveled off after 1960. In contrast, during the 1960s dim sum (red line) was 'discovered' and became rapidly trendy and is still increasingly popular. These differences are mirrored in the frequency with which each of them is mentioned in word counts by Google based on their millions of scanned books. If you;d like to play with this tool by entering other year spans or other foods, Chinese or others, you can enter your own terms in place of the ones I used at this site:  Google Labs Ngram Viewer.