Preheat oven to 180°C and prepare a 9x5 inch loaf tin with baking paper.
Beat butter and sugar until creamy. Add egg, vanilla and lemon juice and beat until well combined.
Add flour and milk alternativly, scraping down the sides to make sure everything is combined. Gently stir through raspberries.
Pour cake batter into prepared loaf tin and bake for 20-25 minutes or until a metal skewer comes out clean. Transfer to a cooking rack.
Once cake has cooled, combine icing sugar and vanilla in a bowl and add the milk 1 tbsp at a time, adding more or less as needed. The icing should be thick and not too runny. Pour over cake and allow to set before serving. Garnish with raspberries if desired.