Many people identify the word “seder” only with Pesach, but many Sephardic and Mizrachi Jews incorporate seders into their celebration of Rosh Hashanah.
Like the Pesach seder, Rosh Hashanah seders feature a variety of foods, each with a special significance to the holiday.
Dates, pumpkin, scallions, and even sheep's head are among a long list of traditional foods. Many uses of these foods revolve around traditional superstitions and represent a desire for health and prosperity.
Here is an example of a Rosh Hashanah Seder booklet that includes many of the food symbols for the new year.