In a medium bowl, whisk together the plain white flour, bicarbonate of soda, baking powder, fine sea salt, soy milk, caster sugar and lemon juice until smooth. Set aside.
120 g plain white flour, ¼ teaspoon bicarbonate of soda, 1 teaspoon baking powder, ½ teaspoon fine sea salt, 200 ml soy milk, 2 teaspoon caster sugar, ½ teaspoon lemon juice