US food manufacturer ConAgra Foods has announced the acquisition of the packaged Mexican food business from Frontera Foods and Red Fork that includes the Frontera, Red Fork and Salpica brands. Frontera is known as a Chicago-based company that produces “premium” Mexican food such as a tex-mex salsa line, sauces, snacks and meals under the Frontera and Salpica brands. Chicago-based Red Fork produces American-style cooking sauces. Frontera was established in 1996 …