To the washed and pat-dried basa cubes, apply the ginger-garlic paste, red chilli flakes, salt to taste and the corn flour (reserve one tablespoon for later). Mix gently to coat well
Heat 3 tbsp oil in your pan and throw in the the marinated fish chunks (in a single layer) and fry until lightly golden on both sides. Remove on kitchen towels and set aside
Add the remaining oil in the pan along with garlic, fresh chilis and dried chilis. When they turn fragrant, add the onions and fry over medium high heat, until they soften
Reduce the flame to medium and add the fish sauce, soy sauce, chili sauce and the tomato ketchup. Mix well and once it comes to a gentle simmer, add in the remaining cornflour dissolved in 2-3 tbsp of cold water* and quickly stir it in
Once the sauce thickens, lower the heat, add the pan fried fish, chilli oil (if using) and the basil leaves. Gently, but completely, mix them with the sauces and remove in a serving dish
Garnish with some more basil leaves, spring greens and chili flakes and serve your delicious pan fried chili basil leaves as is or with some steamed rice. Enjoy!