Grapes light on fire in the microwave

The video by physicist at the University of Sydney that went viral in 2011, showing ignition of  grapes when placed in microwave oven, was answered successfully after two decades. A study published in Proceedings of the National Academy of Sciences in March 05, 2019 reported that the fruity fireball occurs as a result of the loose electrons and ions that cluster to form plasma when grapes get hot.  For more details visit : https://doi.org/10.1073/pnas.1818350116 .