In 2017, Dr. Dênis Pires de Lima from the Federal University of Mato Grosso do Sul, Brazil, was awarded the first prize of € 50,000 for his project “From Cashews to castor oil, combating mosquito-borne diseases.” Contributing to SDGs 3 and 15, Dr. Pires de Lima and his team’s project promoted the use of natural waste from locally sourced cashew nuts and castor oil, to produce environmentally friendly insecticides against mosquitoes carrying Zika and Dengue fever — a sustainable alternative to conventional, substantially toxic insecticides. Three years later, we interviewed Dr. about his experience as a winner of the Green Sustainable Chemistry Challenge, as well as the upcoming steps for his winning project.