Blend the rich culinary history of Mexico, Ireland and Italy, and what do you get? Hot sauce made by a fast-growing Petaluma startup that has cracked into the vast empire of Safeway stores. On March 11, Chuck Ross and his uncle Frank Ross trekked from their tiny Petaluma production kitchen to Safeway headquarters in Pleasanton for a meeting with the North Bay regional buyer that could propel their four-year-old hot sauce company to rapidly accelerating profits.