Cut tofu into bite-sized pieces, slice onion into larger pieces, and chop green onion and green chilies finely.

Mix all seasonings together in a bowl and set aside.

Combine tuna, onion, green chilies, and the prepared seasoning in a bowl. Drain the liquid from the tuna can before mixing.

Layer the seasoned tuna mixture in a pot, place tofu on top, pour rice water evenly, and add green onion on top.

Bring the stew to a boil, then reduce heat to low and simmer until slightly thickened.