Repeat with sesame seeds. In a food processor, puree together pumpkin seeds, chili, sesame seeds, raisins, champurradas and tomatoes. Strain mixture into a casserole dish over medium heat. Add pieces of chocolate, stirring until melted and well blended. Season to taste with salt and pepper and sugar. Add sauteed plantains. Simmer 1-2 minutes until ready to serve.
NOTE: Champurradas are a Guatemalan bread available at specialty bakeries.