Heat the olive oil in a pan and add the chopped onions, garlic, and celery.
Cook until soft.
Add the tomatoes and cook until softened, then dilute with stock to your desired consistency.
Season with salt and pepper.
For the soup:
Finely slice the remaining onions and fry in a little olive oil until soft.
Add the fish fillets and fry for a few minutes on each side.
Carefully cut the cooked fish into large chunks.
Add the fish and onions to the warmed tomato soup.
Serve in a dish, sprinkled with freshly ground black pepper and chopped coriander.
Notes / Tips / Wine Advice:
Serving Tip:Serve the chowder with a slice of crusty bread or a side salad for a complete meal.Wine Advice:Pair with a light white wine like Pinot Grigio or a crisp Sauvignon Blanc to complement the flavors of the chowder.