Preparation
The Method
Heat a large saucepan with a lid over a medium heat. Using a small sharp knife, cut the onion in half and peel off the skin, then put each half on a chopping board and cut into slices, keeping the root intact. Then make 2 horizontal cuts one above the other and finally, chop down across the width of the onion. Add the oil to the heated pan and sauté the onion for 2-3 minutes until softened but not coloured, stirring occasionally with a wooden spoon.
Meanwhile, peel the potatoes and cut into bite-sized pieces. Remove the florets from the cauliflower and Cut the fish into bite-sized pieces with a small sharp knife or a scissors and gently fold into the stew with the prawns. Simmer for another 3-4 minutes until the fish and prawns are cooked through and tender.
Meanwhile, trim and slice the mushrooms and add to the cooked vegetable mixture with the spinach allowing it all to wilt down. If using fish, cut into bite-sized pieces with a small sharp knife or scissors and gently fold into the stew or if using prawns add them now too. Simmer for another 3-4 minutes until the fish or prawns are just cooked through and tender. Season lightly with salt and plenty of freshly ground black pepper. Ladle into bowls and scatter over the coriander, if using to serve.
Prepare Ahead
This stew can be prepared in advance and kept in the fridge for up to 3 days in a suitable airtight container. Reheat gently in a saucepan or in the microwave once to serve, just be careful of the fish so that it doesn’t break up. Alternatively you could make up the stew without the fish and/or prawns and then simply add those once you are ready to reheat it.