In a bowl, add 80 grams plain flour, 40 grams cornflour, pinch bicarbonate of soda and 1/4 teaspoon sea salt. Mix briefly. Slowly add 150 millilitres cold lager or beer, and 1/2 teaspoon sunflower oil, whisking thoroughly. Add more beer continue whisking until the batter is smooth with a slightly thick consistency, something like single cream.
Rest
Set the batter aside in the fridge for 10 minutes.
Fry
Use the batter as per your favourite chip shop style recipes.