Season the fish chunks with salt and black pepper.
In a large skillet or pot, heat a little oil over medium heat.
Add the chopped onion and cook until softened and translucent, about 5 minutes.
Stir in the minced garlic and ginger, and cook for another 2 minutes until fragrant.
Stir in the turmeric powder, paprika, ground cumin, and ground coriander. Cook for 1-2 minutes to toast the spices.
Add the diced tomato, green bell pepper, and red bell pepper. Cook for 3-4 minutes until the vegetables start to soften.
Pour in the coconut milk and bring to a simmer.
Add the seasoned fish chunks to the skillet and gently stir to combine.
Cover and simmer for about 10-15 minutes, or until the fish is cooked through and tender. Stir occasionally.
Adjust the seasoning with salt and black pepper, and add the fish sauce or soy sauce for extra flavor if desired.
Garnish with chopped fresh cilantro or parsley.
Enjoy your meal!