Ingredients: 1 tablespoon baking powder,1/2 teaspoon bicarbonate of soda,100 grams unbleached bread flour,1 teaspoon cider vinegar,1 tablespoon (level) golden (corn) syrup or honey,1 cup milk,2 tablespoons blue poppy seeds,Pinch of salt,85 grams caster sugar,50 ml vegetable or sunflower oil,50 grams unbleached all-purpose flour,1 tablespoon vanilla extract
- Preheat the oven at 180C/350F.Sift together flours, baking powder, bicarbonate of soda and salt; stir in sugar and poppy seeds.
- Place dry ingredients into a 21cm/8-inch square baking tin.With the handle of a wooden spoon, make three holes in the mixture.Put vinegar in one hole, vanilla extract in the second, and oil and golden syrup in the third.
- Pour milk over the mixture and stir, quickly but gently, with a wooden spoon until the mixture is smooth.
- Bake for 25-30 minutes, until risen and centre is springy to the touch.Cool the cake in the tin, then cover tin with foil and refrigerate overnight.