How to ensure diners' focus is firmly on the food? A pitch-black restaurant staffed by blind and partially sighted waiters has already been done, so how's about a restaurant in which your meal has to be consumed in silence?
To be honest, much as encouraging people to appreciate what they're eating is a laudable objective, I don't think I'd enjoy this experience at all. For a start, a bit of conversation across the table is what makes many a meal memorable (more so than the food, in some cases). And then there's the fact that, in the absence of talk, everyone would be subjected to the sound of everyone else's noisy mastication - somewhat off-putting, I'd imagine.
(Thanks to Zoe for the link.)