Rosie's Limoncello & Basil Cake recipe - The Great British Bake Off

Ingredients

• 250g unsalted butter, softened
• 360g caster sugar
• 4 large eggs, beaten
• 360g self-raising flour, sifted
• 1½ tsp baking powder
• 30 basil leaves, very finely chopped
• 4 tbsp limoncello
• 1 tsp lemon extract
• finely grated zest of 4 unwaxed lemons
• pinch of salt
• 200ml soured cream
• 100ml buttermilk
• dried rose petals, to decorate
• 50g granulated sugar, sifted
• 3 tbsp limoncello
• 2 tbsp lemon juice
• 50g caster sugar
• 3 basil leaves
• 75g icing sugar
• 2 tsp buttermilk
• ¼ tsp lemon extract
• 2 tsp lemon juice