• 4 large coliban potatoes
• 1 cup aioli
• 1⁄2 red onion, finely diced
• 1⁄4 bunch dill, finely chopped Juice of 1 lemon
• 600g white fish fillets (such as blue-eye trevalla, snapper, dhufish, flake, gummy shark or rock cod)
• Vegetable oil, to deep fry
• 2 cups sparkling wine, chilled
• 2 tsp fine salt
• 1 cup ice cubes
• 11⁄2 cups plain flour
• 1 cup rice flour
• 1 Tbsp malt vinegar Cornichons, to serve
• Pickled onions, to serve
Cut potatoes into 1cm-wide batons, then put in a steamer over a saucepan of simmering water and steam for 12-15 minutes or until tender. Spread out on an oven tray in a single layer to cool and dry.
Meanwhile, combine aioli, onion, dill and lemon juice in a serving bowl, then set aside. Slice fish into 4cm-wide strips and pat dry with paper towel.
Pour oil into a large, wide heavy-based saucepan until oil comes 6cm up side of pan. Put over a high heat until 180°C on a cook’s thermometer. Fry potato, in 2 batches, for 4 minutes or until golden. Drain on paper towel and keep warm.
Pour sparkling wine, salt and ice into a large bowl. Add plain flour, 1⁄4 cup at a time, mixing in gently after each addition, until a loose batter forms. Dust fish pieces in rice flour, then dip into batter. Drain off excess, then fry in the hot vegetable oil, in 3 batches, for 4 minutes or until just cooked through and crisp. Drain on a plate lined with paper towel.
Pour malt vinegar into a misting spray bottle and spray over battered fish. Divide fish and chips among serving plates and serve with cornichons, pickled onions and aioli sauce.