Recipe for Disaster: Freeing Pirate Pete

Talk to the Cook in the Lumbridge Castle.

Bank any Summoning pouches or Pets.

Talk to Murphy on the docks of Port Khazard.

With your fishbowl, talk to him again.

Equip the fishbowl helmet and diving apparatus.

Whilst weighing under or exactly 27, having your needle and bronze wire, talk to Murphy again. There is a bank deposit box next to Murphy.

Pick some kelp (your inventory is hidden).

It is advisable to obtain multiple in the event you burn the fishcake.

Swim north and talk to Nung.

Head west to the Mudskipper cave and pick up five rocks.

Enter the cave and equip your weapon.

Kill mudskippers for 5 hides.

Return to Nung with the five hides, your needle, and three bronze wire.

Talk to Nung again.

Enter the crab pen and equip your weapon.

Kill some crabs and take their meat.

It is advised to obtain multiple in the event you burn the fishcake.

While in the pen teleport out to Lumbridge.

Alternatively, leave the crab pen and climb up the anchor chain to the south.

Return to the kitchen in Lumbridge Castle.

Prepare the ingredients:

Grind the kelp.

Choose the Grind option on the crab meat.

Choose the Grind option on the raw cod.

Choose the Slice option on the bread.

If at any point while preparing the ingredients, the message "Nothing interesting happens" appears, talk to the Cook.

Talk to the Cook.

Use the ingredients on each other.

Cook the Raw fishcake.

Use fishcake on Pirate Pete.

If the fishcake is eaten, you need to re-obtain all of the ingredients.

Subquest complete!