Use only pure vanilla extract, or vanilla pods. Always avoid anything labelled ‘vanilla flavour’, as it is synthetic and doesn’t taste at all like the real thing. A good habit to get into is to make vanilla sugar. Stick 3-4 vanilla pods into a jar of caster sugar and leave for a week or two. Top up as required. This is invaluable for baking or sprinkling on to shortbreads, cakes and fruits.