Heat palm oil in a saucepan over medium heat.
Add salted tilapia and fry on both sides for 5 minutes, take out and set aside.
Reduce the oil half way down, then add sliced onion, stir until translucent, then add chopped tomatoes, scotch bonnet pepper, stir and let simmer for 5 minutes.
Add powdered crayfish, smoked mackerel, stir and let simmer for 2 minutes.
Add sliced spinach, stir to mix with the sauce, cover and let wilt for 7 minutes.
Add and adjust salt to your taste and let simmer.
Add back fried salted tilapia, stir and let simmer for 3 minutes.
Spinach stew ready to serve. Serve with boiled yam or any side of your choice.