Halloween slash cake - Master recipes

Ingredients

• 140g unsalted butter , plus extra for the tin -
• 100ml grapeseed oil , or another flavourless oil -
• 200ml milk -
• 3 tbsp yogurt -
• 1 tsp vanilla extract -
• 2 large eggs , at room temperature -
• 250g light muscovado sugar -
• 250g plain flour -
• 3 tsp baking powder -
• 50g cocoa powder -
• ¾ x 340g jar strawberry jam -
• 1¼ kg ready-to-roll white fondant icing -
• 600g icing sugar , sifted, plus extra for dusting -
• 300g butter , softened -
• red food colouring -