Prepare the Vegetables: Peel the potato. Cut the potato and onion into bite-sized cubes.
Prep the Aromatics: Thinly slice the green onion diagonally and mince the garlic.
Boil the Base: Pour the water into a pot and add the seafood stock coin. Season the broth with the soup soy sauce and tuna sauce.
Cook: Add the cubed potatoes, onions and minced garlic to the pot. Boil over medium-high heat for about 10 to 12 minutes, or until the potatoes are fully cooked and tender.
Final Touch: Add the sliced green onion and boil for one more minute. Taste the soup, if it’s too bland, add 1 or 2 pinches of salt to suit your preference.