Beer-battered fish

Ingredients

• 1 teaspoon dried yeast
• 1 cup flat beer, at room temperature
• 150 gram flour
• 1 tablespoon oil
• olive oil for frying
• 750 gram filleted fish (such as gurnard), cut into short lengths
• sea salt
• homemade kumara chips and lemon wedges, to serve (see recipe below)
• Oven-baked kumara chips
• 1.2 kilogram golden kumara
• 1 1/2 tablespoon brown sugar
• finely grated zest 1 lemon
• 1 1/2 tablespoon lemon juice
• 30 gram butter