Red velvet cake

Name: Red velvet cake
Prep time: 40 min
Cook time: 2 h 20 min
Total time: 2 h 20 min
Yield: 18 slices
Ingredients: 510 g grapeseed oil; 360 g buttermilk; 3 eggs; 2 tsp natural vanilla extract; 1 ½ tbsp apple cider vinegar; 3 - 4 tsp natural red food colouring; 450 g caster sugar; 450 g plain flour; 30 g cocoa powder; 2 ¼ tsp bicarbonate of soda; ¼ tsp sea salt; 360 g caster sugar; 500 g cream cheese; 80 g unsalted butter; 1 tsp natural vanilla extract