From London to Los Angeles eating crunchy food has produced legal maneuverings and accusations. In the United Kingdom, the holiday tradition of serving Christmas pudding, complete with charms or coins embedded in the food, has left one restaurant so fearful of lawsuits that it now requires patrons to waive their rights to sue before eating. The owners of High Timber in London’s financial district say they were advised to draw up a legal waiver for customers before they dig into their Christmas pudding and run the risk of breaking a tooth.