Food trends can make or break an ingredient’s reputation. All it takes is the publication of a silly carb-less diet or the disclosed eating habits (or lack thereof) of a swanky A-lister and your favorite ingredient could go MIA – either blacklisted at most restaurants or too taboo to enjoy even in your own home. On Monday, Mark Bittman introduced a contest on his NYTimes blog, Bitten, to make a mayonnaise using the residual fat from your bacon. Before you go into a panic attack, take a deep breath and follow me. It’ll be OK.