Cut tofu, onion, and potatoes into bite-sized pieces. Slice green onion and chilies thinly.

Drain the oil from the canned tuna using a sieve.

Mix all seasoning ingredients in a bowl to make the sauce.

In a pot, combine potatoes, onion, tuna, seasoning sauce, and water. Bring to a boil.

Once potatoes are nearly cooked, add tofu.