700 - 800gfirm white fish fillets, such as cod, haddock, barramundi, hake, or flathead
Salt, to taste
Black pepper, to taste
1/2cupplain flour, for dusting
For the batter:
1cupplain flour
1/4cup cornflour
1tspbaking powder
1/2tspsalt, or to taste
250mlvery cold sparkling water or light beer
1tspwhite vinegar or lemon juice
For Simple tartare sauce:
1/2cupmayonnaise
1tbspchopped pickles or capers, or to taste
1tsp lemon juice
1tbspchopped parsley, or to taste
black pepper, to taste
To serve:
Lemon wedges
Tartare sauce or aioli
Instructions
Prepare the chips: Peel the potatoes and cut them into thick chips. Try to keep them similar in size so they cook evenly. Place them in a large bowl of cold water and let them soak for at least 20 minutes. This helps remove excess starch and gives you a better final texture. Drain well, then dry them thoroughly with a clean tea towel or paper towels.
Par-cook the chips: Heat the oil in a deep heavy pot or fryer to 140°C. Fry the chips in batches for 5 to 6 minutes, until softened and lightly cooked through, but still pale. They should not be golden yet. Lift them out and drain on a tray lined with paper towel or set over a rack. Let them rest while you prepare the fish. This first fry gives you the fluffy inside.
Prepare the fish: Pat the fish dry very well. Cut into 4 large pieces if needed. Season lightly with salt and black pepper, then dust each piece lightly in plain flour. Shake off any excess. This helps the batter stick properly.
Make the batter: In a bowl, whisk together the plain flour, cornflour, baking powder, and salt. Pour in the very cold sparkling water or beer and the vinegar or lemon juice, then whisk just until you have a smooth batter. Do not overmix. It should be the consistency of thick pouring cream. Keep the batter cold until ready to use. Cold batter helps create a lighter, crispier coating.
Fry the fish: Heat the oil to 180°C. Dip each floured fish piece into the batter, letting the excess drip off, then carefully lower it into the hot oil. Fry in batches so you do not overcrowd the pan. Cook for 5 to 7 minutes, depending on thickness, until the batter is deep golden and crisp and the fish is cooked through. Lift out and place on a wire rack, not directly onto paper towel if you can help it, as this keeps the coating crisper.
Finish the chips: Bring the oil back to 190°C. Fry the par-cooked chips again in batches for 2 to 4 minutes, until golden, crisp, and beautifully browned. Drain well, then season immediately with salt.
Serve: Pile the hot chips onto plates, add the crispy fish, and serve straight away with lemon wedges, tartare sauce, aioli, and malt vinegar if you like.
Notes
Use floury potatoes for the best chips. They give you that fluffy inside and crisp outside.
Dry everything well. Wet potatoes and damp fish are the quickest way to lose crispness.
Cold batter matters. Very cold sparkling water or beer gives the lightest coating.
Do not overcrowd the fryer. Too much in the oil at once drops the temperature and makes everything heavier and less crisp.
Use a wire rack if possible. It keeps both the fish and chips crisp while the batches finish cooking.
If using beer, choose something light and not too bitter.
Optional extrasIf you want to make the meal feel even more complete, serve it with: