Strawberry is the village of Murky Waters' prize-winning cow. She has the glossiest coat in the area, glossier than her rival in Bullsville, thanks to Abigail, the local healer, who has concocted an ointment to enhance the shine. She is also extremely fond of dried fruit and nuts. Unfortunately for Strawberry, the vodyanoi would like to sacrifice her at the Altar of Dagon.
If Geralt chooses to side with the vodyanoi and offer Strawberry as a sacrifice to Dagon, then he must lure her all the way from her pen in the village to the landing where the Fisher King's boat is tied. He must then take her to Black Tern Island, and once there, to the altar, carefully avoiding any wyverns which might get in the way. Then he must kill her. Yes, kill poor, sweet, glossy-coated Strawberry.
It is really too bad at this point that the game animation does not show Geralt with Strawberry in the boat, that would truly be hilarious.