Meet the Sushi Master, talk to him in the cooking area to grab a Sushi Delivery task and to get ingredients to make Sushi Rolls.
You will need to purchase Rice and Seaweed from his shop which are available for 1 gold coin each.
General Requirements:
All fish must be RAW
15% chance to fail (ingredients consumed, no roll produced)
Once you have made the rolls, you will need use the rolls on the below NPCs to deliver their order.
Dababy
Shura
Lucky Larry
Mysterious Stranger
Skilling Point Shop
Osama Bin Loggin
Fisherman
Master Thief Harami