Chop garlic, onion, green chili peppers, and green onions.

Slice potatoes into bite-sized pieces.

Add 1 tbsp fine chili powder, 1 tbsp coarse chili powder, 2 tbsp corn syrup, and 3 tbsp soy sauce to the pot.

Pour 1/2 cup water into the pot, cover, and bring to a boil.

Simmer for 10 minutes until the potatoes are tender.

Open the canned mackerel and add it along with its liquid to the pot.

Add 1 tbsp coarse chili powder and another 1/2 cup water. Simmer for 5 minutes.

Add the chopped onion, green onions, green chili peppers, and garlic. If desired, add more chili powder for a deeper red color.