A style of atole made with chocolate, champurrado is a deeply warming, more robust relative of hot cocoa. Fresh nixtamalized masa should be used if possible, but masa harina is a widely available substitute. Good-quality masa harina may be found from brands such as Masienda (available online and at retailers such as Whole Foods), and piloncillo and 70 percent cacao Mexican chocolate can be found at Mexican markets and specialty retailers.