Vegan cheesecake

Name: Vegan cheesecake
Ingredients: 200g/7oz vegan bourbon biscuits, crushed (see recipe tip); 75g/2¾oz dairy-free margarine, melted, plus extra for greasing; 350g/12oz vegan dark chocolate, chopped (see recipe tip); 50g/1¾oz cocoa butter (or coconut oil – see recipe tip); 400g/14oz extra-firm silken tofu; 2 tsp vanilla extract; 100g/3½oz caster sugar; 200ml/7fl oz oat crème fraîche; salt; 200g/7oz frozen cherries; 2 tsp cornflour; 3 tbsp kirsch; 50g/1¾oz caster sugar; ½ lemon, juice only