Pat the ahi filets dry with paper towel.
Season both sides evenly with garlic salt.
Heat a pan with a ¼ inch layer of vegetable oil to on medium-high heat.
Fry the ahi in batches, approximately 2 minutes per side. (if you want your ahi on the rare side, increase the heat, and drop the cooking time by half on each side.)
Place the Ahi on a plate.
Remove the pan from the heat and add in the chopped garlic. Allow the garlic to sizzle for 1 minute.
Pour the garlic and oil over the ahi.
Drizzle the ahi with the shoyu and sprinkle over with the green onion slices.
Optional: Squeeze a lemon on top of the ahi.