Being a good listener turned out to be a very viable strategy to win the cook's trust.

With the right combination of helpfulness and an ability to cope with the cook's mood swings, it didn't take long to warm the man up to you.

Spoiler
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A simple diplomacy check with a circumstance bonus of +2 please, to turn the cook from neutral to helpful
Also one Profession Cook check DC 10 or Intelligence check.

You earn 100XP for finishing your first day's work


While you both worked on the evening meal, the cook explained:
"Part of your task is helping me getting the meals ready in time. You won't like it if the crew gets to hungry. It's also your job to use the net and go fishing at the foredeck or use a harpoon to hunt for leather back turtles.
Once the evening meal has been served as well as the rum rations you are free to do whatever, but remember you need to get up early to get the fire going and bring the ship biscuits to the crew."

One hour before dawn, Fishguts nodded at you: "The bloody hour is upon us. You better go on deck and have a good look, so you know what's what around here."