As food prices skyrocket, many shoppers assume that Coles and Woolworths are the cheapest option for consumers – but are they? To find out, a team of Guardian reporters went on a mission to find the cheapest fruit and vegetables in Australia, and what they found exposes some myths about our biggest supermarket chains.Guardian Australia’s data and interactives editor, Nick Evershed, and reporter Mostafa Rachwani, explore the data that industry experts say is a ‘damning indictment’ of the major supermarket chains. Plus: food waste researcher Lukas Parker on how ‘ugly food’ is part of the solution