If you fetch a quick quesadilla or hot dog in Mexico, expect to pay more very soon. Beginning July 1, the 16 percent value-added tax (VAT) will be added to popular prepared foods sold in supermarkets and convenience stores. The new federal tax will cover a variety of foods consumed by busy Mexicans who find less and less time to cook at home, including tortas, tamales, sandwiches, flautas, tacos, hot dogs, roasted chickens, and much more. Food pr…