Among the culinary mainstays that have made their marks on the palates of Laredoans, few have been more essential than La India Packing Company. This April, the family-owned spice-and-herb company hits a monumental milestone as it turns one hundred years old. An official bash celebrating the anniversary is on the books for April 27, and later this year, the Texas Historical Commission will officially designate the company and its headquarters, in old Laredo, with a historical marker. According to owner Elsa Rodriguez Arguindegui, the reason for the company’s success is simple: “People like the flavors and it doesn’t upset their stomachs.” It’s that second part, she says, that makes La India stand out. Her grandfather, Antonio Rodriguez, who founded the shop in April 1924, was insistent…