The Affinities Cake Cooking time: 1 hour 20 mins 200g (7oz) plain flour 75g (2¾oz) unsweetened cocoa powder 1 tsp bicarbonate of soda 200g (7oz) golden caster sugar 100g (3½oz) ground almonds A small pinch of salt 1 tsp vanilla extract 1 tbsp good-quality balsamic vinegar 6 tbsp olive oil, plus extra for greasing 400ml…