What to do with festive specials in the supermarket aisles? Probably leave well aloneWhat really says Christmas to you? Is it a squeezy bottle of Sainsbury's â€œPigs in Blankets Mayoâ€? No? You surprise me. Or not, as the case may be. For the December issue of OFM I tasted that particular joy, and so many other Christmas products, alongside the fabulous chef Ravinder Bhogal. Oh, the things they make us do for you. It is, for the record, mayonnaise punched up with artificial smoke flavouring and, intriguingly for a product with the word â€œpigâ€ in the title, suitable for vegetarians.It's not just terrible. It's also symbolic of a trend that has come to blight the British Christmas: a repeated failure of NPD. Those letters should stand for New Product Development. All too often at this time of year, however, they seem to stand for Neurotic Product Desperation or, most simply put No, Please Don't.