2 fish fillets2 tbsp of olive oil1 onions, finely chopped2 cloves of garlic, finely chopped4 oz or ½ can tomatoes1 tsp of mustard14 oz of mushrooms, sliced½ cup of white wine⅓ cup of water1 fish stock cube1 bunch of coriander, finely chopped2 tbsp of butterSat and pepper to taste