Heat the oil in a large pan over a low heat, and fry the onions until softened. Add the tomato purée and cook for 5-7 mins, then pour in 2 1/2 litres water. Tip in the beef and fish. Bring to the boil and cook for 15 mins. Transfer the fish to a plate using a slotted spoon. Set aside.

Stir in the pepper, garlic, chilli, bay and okra. Season with salt.

Reduce the heat to low and simmer, uncovered, for 25 mins. Add the palm oil and baking powder. Simmer for another 25-30 mins, stirring occasionally. Return the fish to the pan and continue to simmer for 15 mins. Serve with rice.