Crispy Fish Sandwich

Ingredients

• 480 gwhite fish, cut into 4 pieces
• 4burger buns (brioche, if preferred)
• 750 mlfrying oil (canola, sunflower or olive)
• 1 tspsalt
• 30 g (¼ cup)self-raising flour
• 250 mlsparkling water
• 125 g (1 cup)self-raising flour
• 1 tspsalt
• 1 cupwombok, chopped
• ½ cupred cabbage, chopped
• 1carrot, julienned
• ½red onion, chopped
• 1 handfulcoriander
• 10pickled jalapeños
• 2egg yolks
• 1 tspsalt
• 1 clovegarlic, crushed
• 1 tbsplime juice
• 1 handfulcoriander
• 2 tsppickling juice
• 60 ml (¼ cup)olive oil

Instructions

1. 1

   Blend the aioli

   Put the egg yolks, salt, garlic, lime juice, coriander and pickling juice in a mini food processor. Blend while gradually pouring in the olive oil, until the mixture thickens.

2. 2

   Mix the slaw

   Combine the chopped wombok, red cabbage, carrot, red onion, coriander and pickled jalapeños in a bowl and mix.

3. 3

   Whisk the batter

   Whisk the batter ingredients together in a bowl. If it is too thick, add more sparkling water; if it is too thin, add a little more flour.

4. 4

   Heat and flour

   Heat the oil to about 190°C. Season the fish with salt, then dust it with the 30 g of flour.

5. 5

   Fry the fish

   Dip each piece of fish in the batter and lift it to let the excess drip off. Carefully lower it into the hot oil, directing it away from you to reduce splashing. Fry until crisp, about 4–5 minutes, then transfer to a wire rack, season and rest for a minute.

6. 6

   Assemble the sandwiches

   Toast the buns lightly to help prevent them becoming soggy. Spread a little aioli on each bun base, add the fish and slaw, drizzle with more aioli, then top with the bun.

What is a crispy fish sandwich?

A crispy fish sandwich is a handheld meal built around fish in a crunchy coating, served in a bun with fresh or tangy toppings. Versions are enjoyed in many places, so this recipe takes a broadly familiar format rather than following one regional style.

Here, airy sparkling-water batter gives the fish its crisp shell, while cabbage slaw and coriander-lime aioli bring crunch, acidity and a little heat.

Nutrition and macros by portion

The nutrition label shows one serving as written: 2168 calories, 35g protein, 56g carbs, 208g fat.

The buns and flour supply most of the sandwich's carbohydrates, while the frying oil, aioli and brioche buns contribute much of its fat. Fish provides the main protein, with a smaller amount from the egg yolks. Add a side salad or extra slaw to bring more vegetables to the plate.

Choosing the fish and flour

White fish: Cut the fish into four portions of similar size so they cook at roughly the same rate. Pat the pieces dry before seasoning and dusting them; a dry surface helps the flour cling.

Self-raising flour: It is used for both the light coating on the fish and the batter. Keep the flour portions separate so the fish is dusted first and the larger quantity goes into the batter.

Keeping the batter light

Sparkling water: Whisk it into the flour shortly before frying to make a pourable batter. Add extra water or flour in small amounts if needed, as the recipe suggests.

Coating: Let excess batter drip off after dipping each piece. This helps avoid a thick, heavy layer and makes it easier to lower the fish into the oil neatly.

Frying for a crisp finish

Oil temperature: Aim for about 190°C before frying. Lowering the fish into oil that is not hot enough can leave the coating greasy, while oil that is too hot may brown the outside before the fish is cooked through.

Doneness: Fry for about 4–5 minutes, as directed, until the coating is crisp. The exact time can vary with the thickness of the fish, so check that the centre is cooked before serving.

Balancing the slaw and aioli

Slaw: The wombok, red cabbage and carrot give the sandwich a crisp, fresh contrast to the fried coating. Pickled jalapeños add a sharp, spicy note; adjust their amount if you prefer less heat.

Aioli: Gradually adding olive oil while blending helps the egg-yolk mixture thicken. Its lime juice and pickling juice brighten the rich sauce, so taste it before assembly and adjust only if needed.

Serving and assembling

Toast the buns lightly, as the recipe recommends, to help them hold up against the aioli and slaw. Assemble just before eating so the fish stays crisp.

Serve with a simple green salad or extra slaw for a fresh side. Keep the sauce and slaw separate until you are ready to build the sandwiches.

Recipe notes & tips

• Prepare the slaw and aioli before heating the oil so the fish can be served straight from the fryer.
• Use a thermometer to check that the oil reaches about 190°C.
• Lower the battered fish into the oil gently and away from you to reduce splashes.
• Drain the cooked fish on a wire rack rather than leaving it on a flat surface.
• Toast the buns lightly and assemble the sandwiches just before serving.
• Use a clean utensil for tasting the aioli, which contains raw egg yolks.

Variations

• Milder slaw: Use fewer pickled jalapeños for less heat.
• Extra lime: Add a little more lime juice to the aioli for a sharper flavour.
• Different bun: Swap brioche for another burger bun if you prefer.
• More crunch: Add extra wombok or carrot to the slaw.
• Alternative fish: Use another firm white fish cut into four similar-sized portions.

Common mistakes to avoid

• Wet fish: The flour may not cling well; pat the pieces dry before seasoning and dusting.
• Batter too thick: It can coat the fish heavily; loosen it with a little more sparkling water.
• Batter too thin: It may run off the fish; whisk in a little more flour.
• Oil not hot enough: The coating can turn greasy; wait until the oil reaches about 190°C.
• Overcrowded frying: The oil temperature can drop; fry the fish in batches if the pan is small.
• Soggy bun: Sauces and slaw can soften it; toast the bun and assemble just before eating.

How to store

Store leftover fish, slaw and aioli separately in covered containers in the fridge; use the fish within 1–2 days and the aioli within 1 day because it contains raw egg yolks. Reheat the fish in an oven or air fryer until hot and crisp, then assemble with fresh buns and slaw. Do not store assembled sandwiches if you want to preserve the crunch.

Frequently asked questions