Preheat the oven to 180℃/160℃ fan/350℉/gas mark 4. Line a deep 20 cm/8 in round springform cake tin with baking paper.
Sift together the flour, cornflour, cocoa powder, baking powder, bicarbonate of soda and salt.
190 g (1 + ⅓ + ¼ cups) plain (all-purpose) flour, 20 g (2 packed Tablespoons) cornflour (cornstarch), 10 g (1 packed Tablespoon) cocoa powder, ½ teaspoon baking powder, ½ teaspoon bicarbonate of soda (baking soda), ¼ teaspoon salt
Whisk together the melted butter, oil, sugar, milk, yogurt, vanilla and vinegar in a large bowl.
60 g (¼ cup) vegan butter, 55 g (¼ cup) neutral oil , 150 g (¾ cup) caster or granulated sugar, 125 g (½ cup) unsweetened non-dairy milk , 60 g (¼ cup) plain non-dairy yogurt , 1 ½ teaspoons vanilla extract, 1 Tablespoon white wine or cider vinegar
Tip the dry ingredients into the wet and stir gently with a balloon whisk until it is just starting to combine but is still lumpy.
Add a couple of drops of food colouring and continue to stir until no dry lumps remain, adding more food colouring as needed to achieve a deep red colour.
about ¼ teaspoon red gel food colouring
Pour the batter into the prepared tin and bake for about 30 minutes until a skewer inserted into the centre comes out clean. Leave the cake to cool in the tin for 10 minutes then turn it out out onto a wire rack to cool completely.
Once the cake is completely cold, trim the top of the cake with a cake wire or serrated knife to level it and crumble the trimmings into a bowl, set aside to use later.
Wash the springform tin then line the base with baking paper and the sides with acetate or a double layer of baking paper that comes a couple of inches above the top of the tin. The cheesecake mixture will come to the very top of the tin or even slightly above so this is important to prevent it from overflowing. Place the trimmed cake layer in the base of the tin.