In short, the proof will be in the pudding. … Now settle down and hear us out. NPS has developed genetically modified purple-fleshed tomatoes, to contain the high levels of anti-oxidants and anthocyanins normally found in fruits such as blueberries and blackberries. Next-generation GMOs: Genetically engineered purple tomatoes, pink pineapples could get OK from feds. British scientists have been working on developing a dark purple tomato that contains high amounts of the chemical … Large-scale production of the genetically modified purple tomatoes is under way in Canada, where the first 1200 litres of purple tomato juice is ready for shipping, the BBC reports. Purple Tomatoes. Which path the purple tomato … There may be an upside to GMOs. Open licensing of the purple tomatoes’ genetic code could be a welcome step instead of the now common draconian smoke and mirrors act that accompanies nearly every GMO product brought to market.