My favorite pepper is jalapeño because I feel it contains the perfect amount of heat, not as light as a chili and not as harsh as a habanero. Peppers themselves are not spicy, but they contain capsaicinoids that trigger receptors in our mouths. Capsaicinoids are found in the white lines running down the side of the pepper. In order to know how hot a jalapeño pepper is, look at the number of white lines running through it.