Question: what is the enamel on cast iron pans
[{'answer': 'vitreous enamel glaze', 'provenance': [{'wikipedia_id': '3215084', 'title': 'Cast-iron cookware', 'start_paragraph_id': 16, 'start_character': 43, 'end_paragraph_id': 16, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::Enameled cast iron.\n'}]}]