Quick-service and fast casual eateries such as Subway and California Tortilla are responding to consumer demand and upping the ante of spicy ingredients on their menus. According to a report by Datassential, Americans are eating more meals with hot peppers, spicy cheeses and hot sauces. The fastest-growing fiery ingredients are Southeast Asian Sriracha, Chinese chili oil and North African harissa, according to the report.

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