Apple and ricotta loaf

Ingredients

• 125 gram butter, chopped, at room temperature
• 3/4 cup brown sugar
• 2 eggs
• 2 teaspoon grated lemon zest
• 1 3/4 cup self-raising flour
• 1 teaspoon baking powder
• 400 gram can pie apples, mashed
• 1/2 cup fresh ricotta
• 1 apple, cored, thinly sliced
• 1/2 lemon, juiced
• 1 tablespoon castor sugar
• icing sugar, for dusting
• butter, to serve