how does wilde use the subject of cucumber sandwiches to reveal the characters of jack and algy?

I always thought the cucumber sandwiches were meant to help define the character of Algernon more than anything else. Algernon is all about superficial appearances and a poster boy for the Victorian leisure-class man who has too much money and a lot of time. He stuffs his face with cucumber sandwiches using his indulgence as a badge of honor against Victorian rigid manners and courtesy.