Mint Chocolate Pinwheels

I try to avoid using artificial flavourings in my baking, however mint flavouring is an exception, because it’s hard to extract flavour from fresh mint leaves. You can leave out the mint flavouring and colour if you wish, to make chocolate and vanilla pinwheels. Rolling the dough between sheets of baking parchment means you don’t have to use lots of flour, which can mute the wonderful colours of the finished pinwheels.