Elysia Treviño-Gonzales remembers watching pickup trucks with barrels full of empty Twang packets back into her family’s driveway in San Antonio. It was 1986, and it was the responsibility of Treviño-Gonzales and her brothers Jacob, Patrick, and Roger Jr., to fill each of the packets with one ounce of citrus-flavored salt. The kids were rewarded for such tedious work with their own Twang to enjoy. “My favorite combination, even to this day, is probably Church’s fried chicken with our lemon-lime salt and a jalapeño,” says Treviño-Gonzales, now the CEO and president of San Antonio–based Twang. “That was our treat on Sundays after we were done.” It was after those meals that Treviño-Gonzales’s father, founder Roger Treviño Sr., began the hard work. He went to convenience stores…