This is interesting its a new Swedish design for ready meals that emits a whistle when the meal is cooked. The meal is packaged in a similar way to most ready meals with a plastic wrapping. However, it contains a valve in the in the packaging that seals in freshness after the meal is cooked in the factory. The same valve emits a whistle when the meal is cooked much the same as an old fashioned kettle does. It’s an interesting idea and should soon be on sale at Tesco if you fancy trying one.