It may be the nation’s favourite, but is Heinz ketchup actually the best red sauce out there? Our exhaustive research saw us compare the classic to supermarket versions from Tesco, Lidl and Sainsbury’sIt may be the nation’s favourite, but is Heinz ketchup actually the best red sauce out there? Our exhaustive research saw us compare the classic to supermarket versions from Tesco, Lidl and Sainsbury’s