This product does exactly what it says, providing a number of descriptions of desserts which a DM can insert into any game, to provide a little more (pardon the pun) flavor. The descriptions are all excellent and well-written (though some of them spend more time describing the arrangement of the food or the person delivering it than the actual food itself).
Even better, the foods are all very realistic and period-specific (according to the author, they're not just realistic, they're taken from real recipes), which means that you can use this book without fear that you'll wind up accidentally putting something weird, silly, or unnecessarily eldritch onto your PCs' plates when you didn't intend to.
My only complaint is that very few of the dishes are actually named, which would make it difficult for the DM to put them on the menu. Still, it's a free product, so it's nothing to turn your nose up at. Any DM who enjoys spicing up his games with fun bits of fluff should seriously consider incorporating this into his toolbox.