椀種(わんだね)

わんだね
noun
main ingredient in a clear soup
foodcooking
1. wandane; main ingredient of a clear soup
The central, showcased ingredient placed in a lacquered soup bowl for 吸(す)い物(もの) (clear soup) — typically fish, shrimp, tofu, or another item chosen to be the visual and flavor centerpiece of the dish.
今日(きょう)の椀種(わんだね)は鯛(たい)だ。
Today's wandane is sea bream.
Seasonal fish is used as the wandane.
In kaiseki cuisine, the choice of wandane shows the chef's skill.

椀種(わんだね) (bowl + ingredient/seed) is the featured main ingredient of a 吸(す)い物(もの) (clear soup), around which the broth, garnish, and seasoning are built.

A clear soup is structured in three parts:

Choosing and preparing the 椀種(わんだね) well is considered a mark of skill in formal Japanese cooking, especially 懐石(かいせき)料理(りょうり).