Jerk chicken is authentically made with a Scotch bonnet pepper. If you can't find one, a Habanero is the closest substitute. If Habanero peppers are too hot for your tastes, substitute a jalapeño pepper. But whatever chili pepper you use, remember to wear thin rubber gloves. Capsaicin and related compounds called capsaicinoids are the substances that give chili peppers their heat. They cause a burning sensation on soft tissues, so avoid touching your eyes. If you don't have gloves to protect your hands, handle the peppers as little as possible and wash your hands thoroughly in soapy water immediately after cutting them.