From Tar Valon Library
Some say the difficulty of eating with sursa is the source of the Domani merchants' fabled perseverance; others claim it is the source of the equally fabled Domani temper (Glossary).
"It is the fashion to eat the Domani food with the sursa, and of course one does what is the fashion. But... there are none here to see save yourselves, yes? Should you perhaps wish the spoons and the forks, they are under the napkin." (Rendra to Elayne, Nynaeve and Egeanin; (The Shadow Rising, Chapter 51)