This is the 10258th most frequent Polish word.
cebulą
"Ceulą" is the instrumental form of "cebula," meaning "onion."
Here, 'cebulą' is used as an instrumental case noun, indicating the means or tool (seasoning) used for an action.
Posypałem zupę cebulą.
I sprinkled the soup with onion.
In this sentence, 'cebulą' is in the instrumental case, denoting association or accompaniment while the action (handling) is performed.
Obchodzę się z cebulą ostrożnie, aby nie płakać.
I handle the onion carefully to avoid crying.
Here, 'cebulą' is used in the instrumental case to express inclusion or accompaniment in the dish described.