Nearly two months after CRF Frozen Foods set off a massive recall of vegetables thought to be contaminated with listeria and linked to at least two deaths and eight illnesses, a second frozen vegetable supplier — National Frozen Food Corp. — has initiated a separate recall over listeria concerns, and many of the recalled products are from the nation’s largest retailers. The National Frozen Food Corp. announced [PDF] on Monday that it would voluntarily recall ready-to-eat frozen peas and mixed vegetables packaged for a variety of retailers after finding the products may be contaminated with listeria monocytogenes.