A woman in Seesyde Village asks you to deliver some grilled fish to her son in the forest to the north.
Where to Start the Quest
Go to Seesyde Village, northeast of Suthorn Prairie, and talk to the woman on the southeast part of the pier to start the quest.
How to Complete the Quest
First, learn the grilled fish echo, but keep in mind that you have to bring mom's Grilled Fish to her son. He won't accept an echo. So lift the grilled fish and go north from the village. Then go east and look for a fallen stone column over some water. Try to throw the fish onto the column, then jump onto the column and pick it up. There are Moblins to the north. Try to put the fish somewhere far from the Moblins. Defeat the Moblins to unlock the chest. Open it to get 10 riverhorses.
Then go north and make three Old Beds to make some stairs up to the ledge. Throw the Grilled Fish onto each bed, then drop the fish in front of the guy on the ledge. If you did it soon enough, the guy will eat the fish. If not, you have to go back and talk to his mother to try again.
After the guy eats the fish, go back to Seesyde Village and talk to the guy's mother to complete the quest.
Quest Reward
You get 10 piece of Bubble Kelp for completing the quest.