Gluten-free battered fish and chips

Method

• 1
  Preheat oven to 210C. Line 2 large baking trays with baking paper. Cut the potato and sweet potato crossways into 1cm-thick slices. Cut each slice into 1cm-thick batons.
• 2
  Cook the potato and sweet potato in a large saucepan of boiling water for 4 mins or until just tender. Drain well. Pat dry with paper towel. Transfer to a bowl. Drizzle with the oil. Season and toss to coat. Place the potato and sweet potato in a single layer over the prepared trays. Place in oven and cook, turning occasionally, for 50 mins or until golden and crisp.
• 3
  Meanwhile, pat fish dry with paper towel. Cut fish into 8 even portions. Pour vegetable oil into a non-stick frying pan or wok. Heat over medium-high heat. Place the flour and salt in a bowl. Slowly add the chilled soda water, whisking constantly until just smooth (add a little extra soda water if batter is too thick). Dip the fish in the batter to coat, allowing excess batter to drain off. Cook half the fish in oil for 2-3 mins each side or until crisp and cooked through. Place on a wire rack over a baking tray to drain. Repeat with remaining fish. Serve with the chips.