This is the 7560th most frequent Polish word.
kurkowego
"Related to chicken" or "pertaining to poultry."
The word 'kurkowego' in this sentence is derived from 'kurka', meaning 'chanterelle mushroom', and refers to something made of or related to chanterelle mushrooms.
Zrobiłem kurkowego placka na obiad.
I made a mushroom-based pancake for lunch.
Here, 'kurkowego' is an adjective describing the sauce as being chanterelle-based, i.e., made with chanterelle mushrooms.
Czytałem przepis na sos kurkowy.
I read a recipe for chanterelle sauce.
In this context, 'kurkowego' relates to 'kura', ('chicken'), and pertains to specialization in raising poultry.