What's the most important invention in the history of food?

Fellows of the Royal Society, Britain's most distinguished scientific institution, have judged refrigeration, pasteurisation and canning the most significant inventions in the history of food. They were followed by the oven and irrigation, with the full list including the cork, plough and microwave. Some readers may lament the omission of such devices as the melon baller, cheese grater or jelly mould. Tell us if you think they've got the list right, and what they've missed out.