Marinate the Tilapia fillet with salt, pepper, stock powder, dried chili, and tapioca flour. Let it sit for 15 minutes.
Heat oil in a pan, grill the Tilapia fillet until cooked, then set aside.
In a pot, bring water, garlic, ginger, lemongrass, and galangal to a boil.
Add rice, salt, pepper, and mushroom broth, stir well. Cook until the rice becomes porridge-like consistency. Then, add the baby bok choy and remove from heat.
Ladle the porridge into bowls.
Place the grilled Tilapia fillet on top and sprinkle with fried garlic and sliced spring onion. Serve hot.