whole makerel fish or tilapia (about 600 g each) or other white fish, filleted, skin on • garlic, finely chopped • cmginger, finely chopped • tspvegetable stock powder or salt to season • tbspolive oil • onions • garlic, or to taste • cmginger, peeled and grated • green chillies, or to taste • tspground cumin • tspcurry powder • tspfreshly grated nutmeg •